New `team_id` type, updates to built-ins, updated builtin function generation script instructions

[filmaj]

• Adds new Add Bookmark built-in function.
• Adds a new team_id type
• Adds a team_id parameter to Create Channel and Create Usergroup builtins (relates to but does not resolve it #267)
• Updates to the generation script and instructions:
  • For the foreseeable future, the functions.list API will be in flux as it is under active development. As such, the generation instructions have changed to use a different set of APIs as a replacement. The new way is a bit more involved manual process, but it is not so bad (7 API calls using the API Tester instead of 1).
  • The generation script has unfortunately to this point ignored the is_hidden parameter. This means we have released hidden parameters in this SDK 😬 to maintain backwards compatibility, handling of hidden parameters is now a manual process. The generation script will warn if it encounters a hidden parameter. Instructions are updated to have the maintainer carefully review the generated code with respect to hidden parameters. Existing hidden parameters will be kept, but any future hidden parameters should be removed.

How To Deal With Hidden Parameters

We could instead improve the generation script to manually hard-code the list of built-in functions that have had hidden parameters previously exposed, and ignore those / proceed with generation code for them (to maintain backwards compatibility). Any other hidden parameters except the ones already exposed will be skipped for code generation. Thoughts @WilliamBergamin ?

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 98.43%. Comparing base (09d8dcd) to head (dbdf44b).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #327 +/- ## ========================================== + Coverage 98.37% 98.43% +0.05% ========================================== Files 64 65 +1 Lines 2463 2677 +214 Branches 147 147 ========================================== + Hits 2423 2635 +212 - Misses 40 42 +2 ```

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