feat: add possibility to catch errors with bot.catch on webhook

[shevernitskiy]

This PR adds error handling with bot.catch for webhooks.

I have several questions:

• Should we log to the console if no handler is set in case of webhook (in the case of a default handler)?
• Is it necessary to extend the try scope to cover the cases of new Api, new Context, and this.botInfo === undefined? I remove try-catch on a higher level caller handleUpdates which is used on polling. The possible unwrapped errors just missed FATAL console.log

Closes #702

[KnorpelSenf]

These changes are a breath of fresh air, you made an excellent observation about our ability to drop the whole FATAL error thing. Thank you!

I just have a tiny request about the assertion in the test:

[shevernitskiy]

this should work:)

[KnorpelSenf]

Thank you so much!