Support MarkdownV2 text formatting styles

[norkans7]

Add support for formatting options https://core.telegram.org/bots/api#formatting-options

As that is not exactly how other channels such as WhatsApp do that https://faq.whatsapp.com/539178204879377/

I think the user will be responsible to make sure the text will be formatted properly for each channel type

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (870490d) 74.50% compared to head (dd65617) 74.50%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #684 +/- ## ======================================= Coverage 74.50% 74.50% ======================================= Files 98 98 Lines 13021 13022 +1 ======================================= + Hits 9701 9702 +1 Misses 2634 2634 Partials 686 686 ```

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[rowanseymour]

I just tested this an my flows are broken because they use !... I think I need to revert this.

We want as much as possible to allow users to create the same messages across different channels. Maybe there's a way to let users format with the very basic _hello_ *hello* syntax (that conveniently WhatsApp uses).. and convert that where needed in channel handlers. @ericnewcomer

[norkans7]

I had thought the user will be splitting by channel when they want to use that formatting

[norkans7]

Or then support the old Markdown style only https://core.telegram.org/bots/api#markdown-style