feat(apig): add apig_groups data source

[liwanting0517]

What this PR does / why we need it:

Which issue this PR fixes: (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close that issue when PR gets merged) fixes #xxx

Special notes for your reviewer:

Release note:

PR Checklist

• [x] Tests added/passed.
• [x] Documentation updated.
• [x] Schema updated.

Acceptance Steps Performed

=== RUN   TestAccGroupsDataSource_basic
=== PAUSE TestAccGroupsDataSource_basic
=== CONT  TestAccGroupsDataSource_basic
--- PASS: TestAccGroupsDataSource_basic (483.51s)
PASS

=== RUN   TestAccGroupsDataSource_filterById
=== PAUSE TestAccGroupsDataSource_filterById
=== CONT  TestAccGroupsDataSource_filterById
--- PASS: TestAccGroupsDataSource_filterById (611.85s)
PASS

=== RUN   TestAccAppcode_basic
=== PAUSE TestAccAppcode_basic
=== CONT  TestAccAppcode_basic
--- PASS: TestAccAppcode_basic (492.03s)
PASS

=== RUN   TestAccAppcode_manuallyConfig
=== PAUSE TestAccAppcode_manuallyConfig
=== CONT  TestAccAppcode_manuallyConfig
--- PASS: TestAccAppcode_manuallyConfig (490.96s)
PASS

[github-actions[bot]]

This PR exceeds the recommended size of 1000 lines. Please make sure you are NOT addressing multiple issues with one PR. Note this PR might be rejected due to its size.