feat!: implement must_provide

[kaspar030]

This is an experimental draft making it possible to add a hard dependency (and help) to all providers of a provided name, by

a) making a module with the provided name a hard dependency for all providers b) allowing modules to specify must_provide, which makes them unavailable for regular select.

The help aspect of this can be achieved by adding a non-resolving select to a module with the provided name.

[github-actions[bot]]

Bencher Report

Branch	must-provide
Testbed	github-actions

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Benchmark	perf:task-clock	Benchmark Result msec x 1e3 (Result Δ%)	Upper Boundary msec x 1e3 (Limit %)
laze -C RIOT build --global --generate-only	📈 view plot 🚷 view threshold	10.00 x 1e3 (+3.05%) Baseline: 9.70 x 1e3	10.34 x 1e3 (96.74%)

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