SaveCSV simple callback

[JaimeRZP]

Callback designed to allow users to save samples on the go to a CSV file.
We might want to move it to the TuringCallbacks in the future.

[github-actions]

Pull Request Test Coverage Report for Build 5323005738

• 0 of 6 (0.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 0.0%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
src/inference/Inference.jl	0	6	0.0%

Totals
Change from base Build 5313671228:	0.0%
Covered Lines:	0
Relevant Lines:	1433

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💛 - Coveralls

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (e32bb71) 0.00% compared to head (d0cdb37) 0.00%.

❗ Current head d0cdb37 differs from pull request most recent head 4c106a0. Consider uploading reports for the commit 4c106a0 to get more accurate results

Additional details and impacted files

@@          Coverage Diff           @@
##           master   #2020   +/-   ##
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  Coverage    0.00%   0.00%           
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  Files          22      21    -1     
  Lines        1449    1436   -13     
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+ Misses       1449    1436   -13     

Files Changed	Coverage Δ
src/inference/Inference.jl	0.00% <0.00%> (ø)
src/inference/hmc.jl	0.00% <ø> (ø)

... and 4 files with indirect coverage changes

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[yebai]

@JaimeRZP can you convert this into an extension (see we depend on CSV optionally), or transfer it into TuringCallbacks?

[JaimeRZP]

moved to TuringLang/TuringCallbacks.jl#44