Added support for PublisherGW and collaborations

[jkfran]

Done

• Added exchange mechanism to get a PublisheGW macaroon
• Added login version tracking to force re-authentications when needed

How to QA

• Check the authentication flow is working as usual.

Issue / Card

Fixes #4076

[webteam-app]

Demo starting at https://snapcraft-io-4077.demos.haus

[codecov[bot]]

Codecov Report

Merging #4077 (ef3f582) into main (e6cf282) will increase coverage by 0.21%. The diff coverage is n/a.

:exclamation: Current head ef3f582 differs from pull request most recent head e437cb7. Consider uploading reports for the commit e437cb7 to get more accurate results

@@            Coverage Diff             @@
##             main    #4077      +/-   ##
==========================================
+ Coverage   71.77%   71.99%   +0.21%     
==========================================
  Files          90       90              
  Lines        2955     2928      -27     
  Branches      763      755       -8     
==========================================
- Hits         2121     2108      -13     
+ Misses        714      700      -14     
  Partials      120      120              

Flag	Coverage Δ
javascript	71.99% <ø> (+0.21%)	:arrow_up:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
static/js/brand-store/slices/membersSlice.ts	72.22% <0.00%> (-3.97%)	:arrow_down:
static/js/brand-store/slices/currentStoreSlice.ts	72.22% <0.00%> (-3.97%)	:arrow_down:
static/js/brand-store/Settings/Settings.tsx	56.00% <0.00%> (-3.04%)	:arrow_down:
...publisher/shared/SaveAndPreview/SaveAndPreview.tsx
...tic/js/brand-store/StoreNotFound/StoreNotFound.tsx
...atic/js/publisher/shared/PageHeader/PageHeader.tsx
...isher/listing/components/PageHeader/PageHeader.tsx	100.00% <0.00%> (ø)
static/js/brand-store/NoStores/NoStores.tsx	100.00% <0.00%> (ø)
...sting/components/SaveAndPreview/SaveAndPreview.tsx	76.92% <0.00%> (ø)
static/js/brand-store/slices/snapsSlice.ts	11.11% <0.00%> (+1.58%)	:arrow_up:
... and 2 more

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