Workspace model lookups

[bendikberg]

Purpose

Replace the backing collections of the workspace model with ordered dictionaries, to keep the same ordering as the current lists while improving lookup speed for various Dynamo functions.

This PR also simplifies a lot of linq calls.

Performance

All Dynamo functionality that relies on the changed functions will most likely see improved performance, but I could not find any one place that saw a massive improvement from the tests I ran.

Declarations

Check these if you believe they are true

• The codebase is in a better state after this PR
• Is documented according to the standards
• The level of testing this PR includes is appropriate
• User facing strings, if any, are extracted into *.resx files
• All tests pass using the self-service CI.
• Snapshot of UI changes, if any.
• Changes to the API follow Semantic Versioning and are documented in the API Changes document.
• This PR modifies some build requirements and the readme is updated
• This PR contains no files larger than 50 MB

Release Notes

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