Add required claims for generated JWT

[s-vitaliy]

Token generated by previous version did not have an issuer and audience claims, sot it was considered invalid by the token validator.

Scope

Implemented:

• Changed type of the claims object in token generation process: jwt::Claims instead of HashMap<String, String>
• Added iss and aud claims to the token

Checklist

• GitHub issue exists for this change.
• Unit tests added and they pass.
• Line Coverage is at least 80%.
• Review requested on latest commit.

[github-actions]

Coverage after merging add-required-claims-for-jwt into main will be

9.41%

Coverage Report

File	Stmts	Branches	Funcs	Lines	Uncovered Lines
src
main.rs	0%	100%	0%	0%	15, 28–39
src/http
conversions.rs	95.65%	100%	100%	94.74%	26
urls.rs	0%	100%	0%	0%	10–25, 27, 29, 8–9
src/models/external
identity.rs	0%	100%	0%	0%	13–18
identity_provider.rs	0%	100%	0%	0%	10–11, 16–18, 9
token.rs	100%	100%	100%	100%
src/models/internal/v1
token.rs	0%	100%	0%	0%	23–32, 38, 51–54, 57–78
src/services
configuration_manager.rs	0%	100%	0%	0%	25–48, 50–52
external_identity_validator.rs	0%	100%	0%	0%	42–56, 59–67, 76–86
identity_validator_provider.rs	0%	100%	0%	0%	13–15, 46–52, 61–66, 70–73
policy_repository.rs	0%	100%	0%	0%	27–32, 36–46
token_service.rs	0%	100%	0%	0%	39–67, 71–81