feat: create policy for projects

[anujk14]

This PR adds an endpoint to create a policy for a project.

Corresponding Proton PR: raystack/proton#363

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
frontier	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jun 27, 2024 11:07am

[coveralls]

Pull Request Test Coverage Report for Build 9685581272

Details

• 13 of 923 (1.41%) changed or added relevant lines in 6 files are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage decreased (-0.04%) to 9.355%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
pkg/server/interceptors/authorization.go	0	4	0.0%
proto/v1beta1/frontier_grpc.pb.go	0	26	0.0%
internal/api/v1beta1/policy.go	12	42	28.57%
proto/v1beta1/frontier.pb.gw.go	0	95	0.0%
proto/v1beta1/frontier.pb.validate.go	0	188	0.0%
proto/v1beta1/frontier.pb.go	1	568	0.18%

Files with Coverage Reduction	New Missed Lines	%
proto/v1beta1/frontier.pb.go	1	5.73%

Totals
Change from base Build 9639732144:	-0.04%
Covered Lines:	9997
Relevant Lines:	106860

---

💛 - Coveralls

[coveralls]

Pull Request Test Coverage Report for Build 9695452068

Details

• 13 of 927 (1.4%) changed or added relevant lines in 6 files are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage decreased (-0.04%) to 9.355%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
pkg/server/interceptors/authorization.go	0	4	0.0%
proto/v1beta1/frontier_grpc.pb.go	0	26	0.0%
internal/api/v1beta1/policy.go	12	46	26.09%
proto/v1beta1/frontier.pb.gw.go	0	95	0.0%
proto/v1beta1/frontier.pb.validate.go	0	188	0.0%
proto/v1beta1/frontier.pb.go	1	568	0.18%

Files with Coverage Reduction	New Missed Lines	%
proto/v1beta1/frontier.pb.go	1	5.73%

Totals
Change from base Build 9639732144:	-0.04%
Covered Lines:	9997
Relevant Lines:	106864

---

💛 - Coveralls