feat: add auth command to CLI for authentication management

[K-dash]

Summary

• feat: Add nblm.login() Python function and drive_access option to CLI and Python authentication.

Testing

• Pre-commit hooks passed (automatically checked on commit)

Additional Context

[codecov]

Codecov Report

❌ Patch coverage is 48.52941% with 70 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
crates/nblm-cli/src/ops/auth.rs	31.70%	56 Missing ⚠️
crates/nblm-cli/src/args.rs	79.59%	10 Missing ⚠️
crates/nblm-cli/src/main.rs	25.00%	3 Missing ⚠️
crates/nblm-cli/src/app.rs	0.00%	1 Missing ⚠️

@@            Coverage Diff             @@
##             main      #98      +/-   ##
==========================================
- Coverage   88.30%   87.33%   -0.98%     
==========================================
  Files          40       41       +1     
  Lines        5149     5281     +132     
==========================================
+ Hits         4547     4612      +65     
- Misses        602      669      +67     

Flag	Coverage Δ
rust	87.33% <48.52%> (-0.98%)	⬇️

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

Files with missing lines	Coverage Δ
crates/nblm-cli/src/app.rs	95.59% <0.00%> (-0.61%)	⬇️
crates/nblm-cli/src/main.rs	80.00% <25.00%> (ø)
crates/nblm-cli/src/args.rs	71.87% <79.59%> (+25.20%)	⬆️
crates/nblm-cli/src/ops/auth.rs	31.70% <31.70%> (ø)

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