perf: use faster hashing function for hashmaps (ahash)

[dd-oleksii]

Description

Use ahash for hashmaps.

Depending on the feature flag configuration, ahash boosts performance by 5–30% in both flag and bandit benchmarks.

This PR enables it for python and ruby SDKs. Deferring update of rust sdk as it would break the public API and require a major bump.

How has this been documented?

Changelogs.

How has this been tested?

Existing tests and benchmarks.

[changeset-bot]

🦋 Changeset detected

Latest commit: b326a38

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 3 packages

Name	Type
eppo_core	Minor
python-sdk	Patch
ruby-sdk	Patch

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[dd-oleksii]

re test failure: it looks like SDK fetched&parsed configuration faster than python called the next function 😅

    @pytest.mark.rust_only
    def test_configuration_none():
        client = init("ufc", wait_for_init=False)
        configuration = client.get_configuration()
>       assert configuration == None
E       assert <eppo_client.Configuration object at 0x10bf4f4d0> == None

[aarsilv]

ahash looks cool! 💪

[aarsilv]

Nice thinking