Support nested `PermissionsClaimName`

[taraspos]

Is your feature request related to a problem? Please describe.

Some JWT providers use nested claims format, like:

{
  "traits": {
    "temporal": [
      "one",
      "two",
      "three"
    ]
  }
}

Configuring PermissionsClaimName to traits.temporal would allow to use them without needing to write CustomClaimsMapper.

Describe the solution you'd like
Ability to specify JSONPath for PermissionsClaimName.

Describe alternatives you've considered
Creating custom ClaimsMapper as per https://docs.temporal.io/self-hosted-guide/security#authorization