feat: add support for traffic router plugins

[zachaller]

Add traffic router plugin support

This is a continuation of plugins support from #2514

There are two things from the metrics plugin PR that needs to be implemented here still that is a refactor of test to be BDD style. The other is to support multiple plugins names by standardizing around possibly github repo names for the config key for both metrics plugins and traffic router plugins this will require generating safe file names from plugins names like argoproj-labs/sample-rollouts-metric-plugin.

[codecov]

Codecov Report

Patch coverage: 84.34% and project coverage change: +0.01 🎉

Comparison is base (535f244) 81.52% compared to head (c4a6bcb) 81.54%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2573      +/-   ##
==========================================
+ Coverage   81.52%   81.54%   +0.01%     
==========================================
  Files         131      133       +2     
  Lines       19587    19768     +181     
==========================================
+ Hits        15969    16120     +151     
- Misses       2797     2820      +23     
- Partials      821      828       +7     

Impacted Files	Coverage Δ
rollout/trafficrouting.go	72.53% <0.00%> (-3.21%)	⬇️
utils/plugin/downloader.go	59.12% <57.14%> (-0.42%)	⬇️
utils/plugin/plugin.go	47.05% <57.14%> (-6.79%)	⬇️
metricproviders/plugin/rpc/rpc.go	93.23% <78.57%> (-6.77%)	⬇️
rollout/trafficrouting/plugin/rpc/rpc.go	95.86% <95.86%> (ø)
...ricproviders/plugin/rpc/rpc_test_implementation.go	100.00% <100.00%> (+8.57%)	⬆️
...afficrouting/plugin/rpc/rpc_test_implementation.go	100.00% <100.00%> (ø)

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[github-actions]

Go Published Test Results

1 870 tests   1 870 ✔️  2m 30s ⏱️
   118 suites         0 💤
       1 files           0 ❌

Results for commit c4a6bcb.

♻️ This comment has been updated with latest results.

[github-actions]

E2E Tests Published Test Results

    2 files      2 suites   1h 39m 51s ⏱️
  96 tests   91 ✔️ 3 💤 2 ❌
194 runs  186 ✔️ 6 💤 2 ❌

For more details on these failures, see this check.

Results for commit c4a6bcb.

♻️ This comment has been updated with latest results.

[leoluz]

Please check my comments

[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
7 Code Smells

No Coverage information
6.4% Duplication

[leoluz]

LGTM