feat: ctx.send and SendData

[KnorpelSenf]

We want to introduce SendData: an object that specifies all necessary information in order to send a message. This can be a string, or { text: string } or { photo: photo }, etc. Optionally, more parameters can be contained.

This lets us add ctx.send. In grammY 2.0, you can then call ctx.send("message") and ctx.send({ photo }) instead of ctx.reply("message") and ctx.replyWithPhoto(photo).

Similar objects will be introduced for editing messages.

Similar objects will be introduced for calling arbitrary API methods.

This has many advantages:

• ctx.reply has nothing to do with replies so the name is misleading
• it is currently impossible to write a function that generates message data—if you want modularity, you must pass around the context object, which is bad
• menus have no way to edit their own content when they are being navigated to, and send data will make this much better

Naming ideas:

• send data
• send template
• send spec objects
• send blueprints