feat(go): add batch evaluator

[ssbushi]

Fixes: #2054

Checklist (if applicable):

• PR title is following https://www.conventionalcommits.org/en/v1.0.0/
• Tested (manually, unit tested, etc.)

[ssbushi]

@apascal07 I'm unable to understand if the test failures is related to the current PR, can you PTAL? Thanks!

[apascal07]

@apascal07 I'm unable to understand if the test failures is related to the current PR, can you PTAL? Thanks!

=== RUN   TestBatchEvaluator
{TestCaseId: Input:hello world Output:<nil> Context:[] Reference:<nil> TraceIds:[]}
{TestCaseId: Input:Foo bar Output:<nil> Context:[] Reference:<nil> TraceIds:[]}
    evaluator_test.go:276: got <nil>, want test-options
--- FAIL: TestBatchEvaluator (0.00s)

Seems to be yeah. This is the only failure that I can see.

[apascal07]

LGTM other than error return change.