refactor, optimize FormatAll, ParseAll

[thaJeztah]

gofumpt code

add benchmark for Parse, FormatAll

go.mod: bump minimum go version to go1.24

modernize --fix

FormatAll: use a string-builder for formatting os-options

ParseAll: refactor

Avoid using strings.Split, and error on empty values.

Before/after:

goos: darwin
goarch: arm64
pkg: github.com/containerd/platforms
cpu: Apple M3 Pro
                                                             │  before.txt  │              after.txt              │
                                                             │    sec/op    │   sec/op     vs base                │
ParseOSOptions/valid_windows_version_and_feature                611.7n ± 2%   567.0n ± 3%   -7.31% (p=0.000 n=10)
ParseOSOptions/valid_but_lengthy_features                       1.956µ ± 1%   1.838µ ± 2%   -6.06% (p=0.000 n=10)
ParseOSOptions/exploding_plus_chain                             534.6µ ± 1%   512.1µ ± 0%   -4.21% (p=0.000 n=10)
ParseOSOptions/kernel_config_feature_blob                       803.4µ ± 2%   768.1µ ± 1%   -4.39% (p=0.000 n=10)
FormatAllOSFeatures/plain_linux_amd64                           43.26n ± 1%   38.53n ± 1%  -10.94% (p=0.000 n=10)
FormatAllOSFeatures/windows_version_and_feature                 208.9n ± 2%   135.8n ± 1%  -35.01% (p=0.000 n=10)
FormatAllOSFeatures/valid_but_lengthy_features                  937.4n ± 1%   150.1n ± 1%  -83.99% (p=0.000 n=10)
FormatAllOSFeatures/skips_empty_features                        305.9n ± 1%   171.1n ± 2%  -44.07% (p=0.000 n=10)
FormatAllOSFeatures/kernel_config_feature_blob                  82.32µ ± 1%   74.79µ ± 1%   -9.15% (p=0.000 n=10)
FormatAllOSFeatures/many_kernel_config_features_with_empties   595.03µ ± 1%   72.44µ ± 1%  -87.83% (p=0.000 n=10)
FormatAllOSFeatures/too_many_features                          620.65n ± 2%   89.29n ± 1%  -85.61% (p=0.000 n=10)
geomean                                                         4.916µ        2.525µ       -48.63%

                                                             │  before.txt   │               after.txt                │
                                                             │     B/op      │     B/op      vs base                  │
ParseOSOptions/valid_windows_version_and_feature                  224.0 ± 0%     208.0 ± 0%   -7.14% (p=0.000 n=10)
ParseOSOptions/valid_but_lengthy_features                       1.109Ki ± 0%   1.109Ki ± 0%        ~ (p=1.000 n=10) ¹
ParseOSOptions/exploding_plus_chain                             496.4Ki ± 0%   496.4Ki ± 0%        ~ (p=1.000 n=10) ¹
ParseOSOptions/kernel_config_feature_blob                       720.4Ki ± 0%   720.4Ki ± 0%        ~ (p=1.000 n=10) ¹
FormatAllOSFeatures/plain_linux_amd64                             16.00 ± 0%     16.00 ± 0%        ~ (p=1.000 n=10) ¹
FormatAllOSFeatures/windows_version_and_feature                   184.0 ± 0%     160.0 ± 0%  -13.04% (p=0.000 n=10)
FormatAllOSFeatures/valid_but_lengthy_features                  1776.00 ± 0%     72.00 ± 0%  -95.95% (p=0.000 n=10)
FormatAllOSFeatures/skips_empty_features                          176.0 ± 0%     136.0 ± 0%  -22.73% (p=0.000 n=10)
FormatAllOSFeatures/kernel_config_feature_blob                  360.1Ki ± 0%   288.0Ki ± 0%  -20.01% (p=0.000 n=10)
FormatAllOSFeatures/many_kernel_config_features_with_empties   6720.5Ki ± 0%   121.5Ki ± 0%  -98.19% (p=0.000 n=10)
FormatAllOSFeatures/too_many_features                            272.00 ± 0%     24.00 ± 0%  -91.18% (p=0.000 n=10)
geomean                                                         4.980Ki        1.945Ki       -60.94%
¹ all samples are equal

                                                             │  before.txt  │              after.txt               │
                                                             │  allocs/op   │ allocs/op   vs base                  │
ParseOSOptions/valid_windows_version_and_feature                 5.000 ± 0%   4.000 ± 0%  -20.00% (p=0.000 n=10)
ParseOSOptions/valid_but_lengthy_features                        10.00 ± 0%   10.00 ± 0%        ~ (p=1.000 n=10) ¹
ParseOSOptions/exploding_plus_chain                              12.00 ± 0%   12.00 ± 0%        ~ (p=1.000 n=10) ¹
ParseOSOptions/kernel_config_feature_blob                        13.00 ± 0%   13.00 ± 0%        ~ (p=1.000 n=10) ¹
FormatAllOSFeatures/plain_linux_amd64                            1.000 ± 0%   1.000 ± 0%        ~ (p=1.000 n=10) ¹
FormatAllOSFeatures/windows_version_and_feature                  6.000 ± 0%   5.000 ± 0%  -16.67% (p=0.000 n=10)
FormatAllOSFeatures/valid_but_lengthy_features                  22.000 ± 0%   4.000 ± 0%  -81.82% (p=0.000 n=10)
FormatAllOSFeatures/skips_empty_features                         8.000 ± 0%   5.000 ± 0%  -37.50% (p=0.000 n=10)
FormatAllOSFeatures/kernel_config_feature_blob                   8.000 ± 0%   5.000 ± 0%  -37.50% (p=0.000 n=10)
FormatAllOSFeatures/many_kernel_config_features_with_empties   1034.00 ± 0%   21.00 ± 0%  -97.97% (p=0.000 n=10)
FormatAllOSFeatures/too_many_features                           20.000 ± 0%   2.000 ± 0%  -90.00% (p=0.000 n=10)
geomean                                                          12.68        5.469       -56.87%
¹ all samples are equal