Basic documentation

[pileks]

This PR adds basic documentation for the most important parts of the polywrap package.

Additional comments/feedback much appreciated!

[codecov]

Codecov Report

All modified lines are covered by tests ✅

Files	Coverage Δ
packages/builder/src/polywrap_base_resolver.rs	79.16% <ø> (ø)
packages/builder/src/polywrap_client_config.rs	95.54% <ø> (-0.41%)	⬇️
packages/client/src/client.rs	93.86% <ø> (ø)
packages/client/src/subinvoker.rs	80.00% <ø> (ø)
packages/core/macros/src/lib.rs	85.00% <ø> (ø)
packages/core/src/client.rs	54.54% <ø> (ø)
packages/core/src/error.rs	100.00% <ø> (ø)
packages/core/src/redirects.rs	0.00% <ø> (ø)
...ges/core/src/resolution/get_uri_resolution_path.rs	0.00% <ø> (ø)
...ages/core/src/resolution/uri_resolution_context.rs	70.00% <ø> (ø)
... and 3 more

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