chore(BUX-600): rename go-buxclient

[wregulski]

TODO:

• Update package names for bux-models and bux,
• Update CODEOWNERS & workflows (other tasks).

Pull Request Checklist

• 📖 I created my PR using provided : CODE_STANDARDS
• 📖 I have read the short Code of Conduct: CODE_OF_CONDUCT
• 🏠 I tested my changes locally.
• ✅ I have provided tests for my changes.
• 📝 I have used conventional commits.
• 📗 I have updated any related documentation.
• 💾 PR was issued based on the Github or Jira issue.

[github-actions]

Manual Tests

💚 Manual testing by @arkadiuszos4chain resulted in success.

[codecov]

Codecov Report

Attention: 35 lines in your changes are missing coverage. Please review.

Comparison is base (42806e5) 59.91% compared to head (6ca6745) 59.91%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #195   +/-   ##
=======================================
  Coverage   59.91%   59.91%           
=======================================
  Files          16       16           
  Lines         978      978           
=======================================
  Hits          586      586           
  Misses        315      315           
  Partials       77       77           

Flag	Coverage Δ
unittests	59.91% <73.88%> (ø)

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

Files	Coverage Δ
access_keys.go	100.00% <100.00%> (ø)
client_options.go	100.00% <100.00%> (ø)
destinations.go	100.00% <100.00%> (ø)
fixtures/fixtures.go	60.00% <ø> (ø)
paymail_addresses.go	100.00% <100.00%> (ø)
transactions.go	100.00% <100.00%> (ø)
transports/errors.go	72.72% <100.00%> (ø)
transports/transports.go	83.33% <100.00%> (ø)
walletclient.go	96.29% <100.00%> (ø)
xpubs.go	100.00% <100.00%> (ø)
... and 3 more

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