feat(ums): introduce currentUser

[reinos]

PR Checklist

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• The commit message follows our conventions
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

[ ] Bugfix
[x] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Build related changes
[ ] CI related changes
[ ] Documentation content changes
[ ] Other... Please describe:

What is the current behavior?

Currently there is no way to get the current user that is logged.

Issue Number: N/A

What is the new behavior?

This PR introduce

• a new api method to get the current logged-in user via ums.isLoggedIn([alias: optional]).subscribe()
• changed the ums.signIn() to return the current user that has been logged in, instead of the token. Tokens are no concern of the user as it will handle all by the SDK.

Does this PR introduce a breaking change?

[x] Yes
[ ] No

Other information

The ums.signIn() method will not return a token anymore, but instead of that. It will return the current user.

[miss-tique]

🎉 This PR is included in version 5.9.0 🎉

The release is available on:

• GitHub release
• npm package (@latest dist-tag)

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