feat(auth): Adding token auth

[Jacobbrewer1]

Describe your changes

This pull request introduces improvements to the authentication mechanisms in the client library. The changes include adding a new token-based authentication method and ensuring that the authentication information is renewed correctly for all authentication methods.

Enhancements to authentication mechanisms:

• client_opts.go: Added a new function WithTokenAuth to support token-based authentication.
• client_opts.go: Modified WithAppRoleAuth and WithUserPassAuth to handle errors more gracefully and to ensure that authentication information is renewed.
• token.go: Introduced a new file to implement the tokenLogin function for token-based authentication.

Codebase simplification:

• client.go: Removed the call to renewAuthInfo from the NewClient function to avoid redundant renewals.

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