http-api: T8989: add REST Bearer token authentication

Add JWT Bearer token support to the REST API, as an additional
authentication method alongside the existing form-field key and
X-API-Key header.

- New POST /token endpoint mints a JWT for a valid API key
- auth_required() accepts Authorization: Bearer <token> alongside
  existing key/X-API-Key auth
- New config nodes: service https api rest authentication
  {expiration, secret-length} (defaults: 3600s / 32 bytes)
- REST tokens use an independent signing secret from GraphQL's,
  since GraphQL may not be enabled on all deployments and the two
  subsystems have different expiry requirements
- nginx location regex updated to allow /token
- service_https.py default-value merge generalized to also apply
  to the rest node, not just graphql, so REST authentication
  defaults populate correctly on commit

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