feat: add elixir-provider

[JoE11-y]

Description

• Hello @thomaspoignant This resolves (feature) OpenFeature Elixir Provider #2493

Work to do:

• Testing
• Optimization to standard practices.

Pr adding elixir provider to the go-feature-flag

Closes issue(s)

Resolve #

Checklist

• I have tested this code
• I have added unit test to cover this code
• I have updated the documentation (README.md and /website/docs)
• I have followed the contributing guide

[netlify]

✅ Deploy Preview for go-feature-flag-doc-preview canceled.

Name	Link
🔨 Latest commit	c534b25
🔍 Latest deploy log	https://app.netlify.com/sites/go-feature-flag-doc-preview/deploys/672bbd65bbfdd900087f9f6d

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.96%. Comparing base (1d92408) to head (c534b25).
Report is 28 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2610      +/-   ##
==========================================
- Coverage   85.11%   84.96%   -0.16%     
==========================================
  Files         101      102       +1     
  Lines        4582     4721     +139     
==========================================
+ Hits         3900     4011     +111     
- Misses        544      564      +20     
- Partials      138      146       +8     

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[thomaspoignant]

Hey @JoE11-y thanks a lot for this pull request, I am super excited to have support for Elixir 😄.

I haven't looked enough yet to be able to provide feedback, but I was wondering if you plan to add any tests for this PR?
Forget about it, I should have read the PR description.

I am really looking forward to complete this PR 🙌 .

[JoE11-y]

Thank you @thomaspoignant.

Will complete this by today's end 💪

[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud