Description
Implements custom date expiration for Access Tokens and Hmac Keys/tokens leveraging the expires column within auth_identities table.

Implements setAccessTokenExpirationById() method, getAccessTokenTimeToExpire(), hasHmacTokenExpired() trait methods and the CLI command shield:hmac invalidateAll.

Implements #926

Checklist:

• Securely signed commits
• Component(s) with PHPDoc blocks, only if necessary or adds value
• Unit testing, with >80% coverage
• User guide updated
• Conforms to style guide