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Add cc_action_type and cc_tool documentation
Extends the toolchain API documentation to include docs for cc_action_type, cc_action_type_set, cc_variable, and cc_tool.
Also improves cross-reference links and copybara behavior for docs.
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PiperOrigin-RevId: 680601617
Change-Id: Idbbdfbcb2c5a1c3598b6a7e7ba985ed14f871099
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Improve errors in variable definitions by adding labels to the variables.
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PiperOrigin-RevId: 618984216
Change-Id: I5d6d11ba2b72f426b9f01bcbb528b0914c98c964
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Add strictly typed variables to toolchain rules.
This should allow us to implement a proper replacement for flag_group
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PiperOrigin-RevId: 617338607
Change-Id: I7f3058578cb5eb17ecc1aa38d2e1459e0742aee9