Add Interception Module

[jarq6c]

Adds a module to compute basic estimates of canopy interception using reasonable defaults from literature.

Additions

• compute_canopy_saturation
• compute_trunk_saturation
• compute_canopy_loss
• compute_trunk_loss
• compute_interception

Removals

Changes

Testing

Notes

Todos

Checklist

• PR has an informative and human-readable title
• PR is well outlined and documented. See #12 for an example
• Changes are limited to a single goal (no scope creep)
• Code can be automatically merged (no conflicts)
• Code follows project standards (see CONTRIBUTING.md)
• Passes all existing automated tests
• Any change in functionality is tested
• New functions are documented (with a description, list of inputs, and expected output) using numpy docstring formatting
• Placeholder code is flagged / future todos are captured in comments
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[jarq6c]

Thanks @hellkite500 ! I implemented your recommendations. The module passes all tests and will be merged.