New join community workflow

[iurimatias]

Description

figma: https://www.figma.com/file/17fc13UBFvInrLgNUKJJg5/Kuba%E2%8E%9CDesktop?node-id=2312%3A298851
feature spec: https://github.com/status-im/feature-specs/pull/79/files

out of scope:

• token based permissions IS OUT OF SCOPE FOR THIS TASK
• hcaptcha

goal: implement the various features & changes present in the workflow in figma:

• Should be possible to view a community without being a member (but not send messages)
• Button to join community if community doesn't require membership approval
• Button to request to join community if community requires membership approval
• Modify welcome modal to be as in the design (note buttons are different depending if it's to join a community or to request joining one)
• User should see an ephermeral notification that a request has been made
• User should see an ephermeral notification that a request has been accepted or rejected
• Community Request should be present in activity center #8313
• User should be able to cancel an ongoing membership request
• Community invites in chat should still work as expected
• Squish tests might need to be updated or made for this

[John-44]

(copying a comment into this issue as this comment contains pictures that describe what's needed a bit clearer)

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@iurimatias @osmaczko @faust4exe @jrainville The behaviour shown in this screencast is incorrect.

186612309-384de00d-8967-44ec-8d5b-c599352214ae.mp4

When the user in the right screen clicks "Request Access" (btw this button text should be changed to "Go to Community" in all cases), a popup should not appear.

Instead the user should be redirected to the home screen for the community:

1. If the Community is an open community (e.g. no token permissions at the community level) and if 'manual membership approval' is set to No, then the user should see this:
   
   (link to figma https://www.figma.com/file/17fc13UBFvInrLgNUKJJg5/Kuba%E2%8E%9CDesktop?node-id=2244%3A260547 )

2. If the Community is an open community (e.g. no token permissions at the community level) and if 'manual membership approval' is set to Yes, then the user should see this:
   
   (link to figma https://www.figma.com/file/17fc13UBFvInrLgNUKJJg5/Kuba%E2%8E%9CDesktop?node-id=2365%3A296006 )

3. If the Community is a closed community (e.g. there are token permissions at the community level) and if 'manual membership approval' is set to No, then the user should see this if they hold the tokens needed to access the community:
   
   (link to figma https://www.figma.com/file/17fc13UBFvInrLgNUKJJg5/Kuba%E2%8E%9CDesktop?node-id=2314%3A257946 )

4. If the Community is a closed community (e.g. there are token permissions at the community level) and if 'manual membership approval' is set to No, then the user should see this if they do not hold the tokens needed to access the community:
   
   (link to figma https://www.figma.com/file/17fc13UBFvInrLgNUKJJg5/Kuba%E2%8E%9CDesktop?node-id=2367%3A280302 )

5. If the Community is a closed community (e.g. there are token permissions at the community level) and if 'manual membership approval' is set to Yes, then the user should see this if they hold the tokens needed to access the community:
   
   (link to figma https://www.figma.com/file/17fc13UBFvInrLgNUKJJg5/Kuba%E2%8E%9CDesktop?node-id=2365%3A317460 )

6. If the Community is a closed community (e.g. there are token permissions at the community level) and if 'manual membership approval' is set to Yes, then the user should see this if they do not hold the tokens needed to access the community:
   
   (link to figma https://www.figma.com/file/17fc13UBFvInrLgNUKJJg5/Kuba%E2%8E%9CDesktop?node-id=2365%3A317901)