feat: introduce API to import discord community

[0x-r4bbit]

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THIS IS A WIP

Here's what it does so far:

1. It adds a new ImportDiscordCommunity RPC API that takes filesToImport []string and a CreateCommunityRequest
2. It creates a community
3. It creates community categories based on extracted discord categories
4. It creates community channels based on extracted discord channels
5. It converts extracted DiscordMessage's to ChatMessage's and stores them in the DB

What still needs to be done:

• [ ] Importing large amounts of data sometimes loses channels (Needs investigation)
• [ ] Provide an async version as importing large data takes long
• [ ] Introduce signals so clients know progress of import
• [ ] Figure out how to handle attachements/embedds/assets (chances are this has to be done in the client)

[status-github-bot[bot]]

Pull Request Checklist

• [ ] Have you updated the documentation, if impacted (e.g. docs.status.im)?
• [ ] Have you tested changes with mobile?
• [ ] Have you tested changes with desktop?

[status-im-auto]

Jenkins Builds

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:grey_question:	Commit	:hash:	Finished (UTC)	Duration	Platform	Result
:heavy_check_mark:	74d9c7f3	#1	2022-07-21 20:38:30	~2 min	linux	:package:zip
:heavy_check_mark:	74d9c7f3	#1	2022-07-21 20:40:33	~4 min	android	:package:aar
:heavy_check_mark:	74d9c7f3	#1	2022-07-21 20:40:54	~4 min	ios	:package:zip

:grey_question:	Commit	:hash:	Finished (UTC)	Duration	Platform	Result
:heavy_check_mark:	9874f422	#2	2022-07-26 11:54:24	~4 min	android	:package:aar
:heavy_check_mark:	9874f422	#2	2022-07-26 11:55:00	~5 min	ios	:package:zip
:heavy_check_mark:	9874f422	#2	2022-07-26 11:56:06	~6 min	linux	:package:zip
:heavy_check_mark:	f9418f2c	#3	2022-07-27 17:14:34	~1 min	linux	:package:zip
:heavy_check_mark:	f9418f2c	#3	2022-07-27 17:15:21	~2 min	ios	:package:zip
:heavy_check_mark:	f9418f2c	#3	2022-07-27 17:17:52	~5 min	android	:package:aar