feat(codehub/repository): add new resource support

[Lance52259]

What this PR does / why we need it: Add a new resource support for CodeHub service, which are automatically generated by the tool.

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:

1. add new CodeHub repository resource support.

PR Checklist

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

Acceptance Steps Performed

make testacc TEST='./huaweicloud/services/acceptance/codehub' TESTARGS='-run=TestAccRepository_'
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./huaweicloud/services/acceptance/codehub -v -run=TestAccRepository_ -timeout 360m -parallel 4
=== RUN   TestAccRepository_basic
=== PAUSE TestAccRepository_basic
=== RUN   TestAccRepository_default
=== PAUSE TestAccRepository_default
=== CONT  TestAccRepository_basic
=== CONT  TestAccRepository_default
--- PASS: TestAccRepository_basic (46.00s)
--- PASS: TestAccRepository_default (46.18s)
PASS
ok      github.com/huaweicloud/terraform-provider-huaweicloud/huaweicloud/services/acceptance/codehub   46.265s