Revamp the discord interaction format

[m-haisham]

Proposal

I'm essentially proposing forgoing the current start and the other choices that follow by introducing a small domain-specific language.

Grammar

The following describes the grammar in a readable manner.

Download => [download] <url> [from <from:int>] [to <to:int>] [into <...target:str>]
Select   => [select] <option:int>
Close    => close [session]
Search   => search [with] <key:any>
Status   => [show] status

Where [optional] <input>

Example

Usecase 1: Download with just URL

The user sends the following message in the private channel:

https://www.webnovel.com/book/my-vampire-system_16709365405930105

This falls under the download rule, hence the bot will fill in the other options with defaults (ex: from=0 to=end, target=['epub']) and create a new download session.

Usecase 2: Download with other information

The user sends the message:

https://www.webnovel.com/book/my-vampire-system_16709365405930105 from 25 to 100 into epub, text, html

The bot will then start a download session using the provided information.

[budikesuma]

I don't think these things are needed, as they won't be used by even 1% of the bot's users themselves, since bots have been pretty good with options that are more convenient for end users.
Should understand why people use the bot version, because they don't want to be bothered with the command line terminal, instead why not just use termux/exe/pyDroid/google colab?