feat(projectman): add a new resource to manage project

[hmbig2]

What this PR does / why we need it: add a new resource to manage project

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

make testacc TEST='./huaweicloud/services/acceptance/projectman' TESTARGS='-run=TestAccProject_basic'
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./huaweicloud/services/acceptance/projectman -v -run=TestAccProject_basic -timeout 360m -parallel 4
=== RUN   TestAccProject_basic
=== PAUSE TestAccProject_basic
=== CONT  TestAccProject_basic
--- PASS: TestAccProject_basic (49.24s)
PASS
ok      github.com/huaweicloud/terraform-provider-huaweicloud/huaweicloud/services/acceptance/projectman        49.302s