Refresh Token Issuing for new Kafka Clients

[dakota002]

Resolves #2991

This adds:

• Table for storing refresh tokens
• Python sample code update (behind TOKEN_AUTH flag)
• Token Generation Credential form and card UI (behind TOKEN_AUTH flag)
• Scoped login behavior to get tokens bound to single scope

Still needs to:

• Update sample code for other languages
• Finish up UI and CRUD behavior for stored tokens

[codecov]

Codecov Report

Attention: Patch coverage is 2.51572% with 155 lines in your changes missing coverage. Please review.

Project coverage is 6.39%. Comparing base (8cace87) to head (610dcf2).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
app/components/NewCredentialForm.tsx	0.00%	48 Missing ⚠️
app/routes/_auth.login.ts	0.00%	16 Missing ⚠️
app/routes/_auth/user.server.ts	0.00%	16 Missing ⚠️
app/routes/user.credentials._index.tsx	0.00%	15 Missing ⚠️
app/lib/cognito.server.ts	14.28%	12 Missing ⚠️
app/components/RefreshTokenCard.tsx	0.00%	10 Missing ⚠️
app/routes/quickstart.code.tsx	0.00%	10 Missing ⚠️
app/routes/_auth/auth.server.ts	0.00%	8 Missing ⚠️
app/routes/quickstart.credentials.tsx	0.00%	8 Missing ⚠️
app/routes/user.token.$tokenId.ts	0.00%	6 Missing ⚠️
... and 2 more

Additional details and impacted files

@@           Coverage Diff            @@
##            main   #3095      +/-   ##
========================================
- Coverage   6.51%   6.39%   -0.13%     
========================================
  Files        179     181       +2     
  Lines       4422    4552     +130     
  Branches     486     503      +17     
========================================
+ Hits         288     291       +3     
- Misses      4132    4259     +127     
  Partials       2       2              

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