Adding relation methods to context objects

[rmyers]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 98.57651% with 4 lines in your changes missing coverage. Please review.

Project coverage is 99.20%. Comparing base (0a0d360) to head (251e3f7).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
cannula/codegen/generate_context.py	92.85%	3 Missing ⚠️
cannula/types.py	98.98%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #112      +/-   ##
==========================================
- Coverage   99.40%   99.20%   -0.21%     
==========================================
  Files          34       33       -1     
  Lines        1524     1635     +111     
==========================================
+ Hits         1515     1622     +107     
- Misses          9       13       +4     

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