feat: add isInitialized

[ghost]

This change adds the "isInitialized" function
Now it is impossible to check whether initialization has been performed. This may cause errors when using modules that also use electron/remote.
Current code (so that it does not throw an error if initialization has already been done):

try { remote.initialize(); } catch { }

New code:

if (!remote.isInitialized()) {
     remote.initialize();
}

[continuous-auth]

🎉 This PR is included in version 2.1.0 🎉

The release is available on:

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

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