[CHAT-1650] Add user, application level token revoke helpers and iat claim in tokens

[SiddhantAgarwal]

CLA

• I have signed the Stream CLA (required).
• Code changes are tested

Description of the changes, What, Why and How?

Changelog

• createToken add support to have iat claim while generating tokens.
• added revokeTokens() method to revoke/unrevoke tokens on an application level.
• added revokeUserToken() method to revoke/unrevoke tokens on user level.
• added revokenUsersToken() method to revoke/unrevoke tokens for multiple users at once.

[github-actions]

Size Change: +2.79 kB (1%)

Total Size: 227 kB

Filename	Size	Change
dist/browser.es.js	49.4 kB	+610 B (1%)
dist/browser.full-bundle.min.js	28.3 kB	+264 B (0%)
dist/browser.js	49.9 kB	+635 B (1%)
dist/index.es.js	49.4 kB	+629 B (1%)
dist/index.js	50 kB	+655 B (1%)

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