feat(body): add entities formatting support

[BubuMVX]

Hi !

This pull request adds the support to entities on text messages sent. This allows:

• messages to be formatted with this Telegram method, instead of Markdown or HTML,
• the usage of FormattedString objects created with grammyjs/parse-mode.

Example

import { bold, fmt, underline } from '@grammyjs/parse-mode';
import { MenuTemplate } from 'grammy-inline-menu';

const menu = new MenuTemplate<MyContext>(async () => {
    const message = fmt`${bold(underline('Hello world!'))}`

    return {
        text: message.text,
        entities: message.entities,
    };
});

[BubuMVX]

Hi @EdJoPaTo !

Sorry, but I struggle to fix this @typescript-eslint/prefer-readonly-parameter-types error. I tried Readonly<>, ReadonlyArray<> and stuff like that, without success.

Can you help me or point me in the right direction? Thanks.

[BubuMVX]

Tests added, I hope they're in line with your standards.

[BubuMVX]

Thanks a lot for your feedback, I updated the documentation

[BubuMVX]

Wanted to hit the approve and merge, but I have more nitpicks… Sorry for that! 😇

Hahaha! Don't hesitate! Corrections added

[EdJoPaTo]

Thank you for the addition!

It's released as 9.1.0 :sparkles:

[BubuMVX]

Nice! Thank you so much for your library. It's one of the best for Telegram bots I've encountered so far.