Backport "Changes in preparation to make caps.Capability stable" to 3.7.0
#22962
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Make `scala.caps` a package instead of an object. The following are still under `scala.caps`, while staying `@experimental`: - The Capability trait, which will be stable in near future - The universal capture reference `cap` -- **now an object**. - The carrier trait for capture set parameters `CapSet` - The `Contains` trait: - Due to `given`s cannot be marked `@experimental`, an experimental `Contains` object was created instead, which contains the `containsImpl` given. - Exclusive capabilities annotations: `Mutable`, `SharedCapability` and `consume` - The _`Exists`_ trait is marked `deprecated`, but is required to build the current version of the compiler. It should be removed in the next version. - The `unsafe` object: - `untrackedCaptures` is moved into `caps.unsafe`. - Deprecated aliases `*` and `Cap` are **removed** The following are moved under the experimental `scala.caps.internal` object: - `capsOf` - `rootCapability`, `reachCapability` and `readOnlyCapability` - `refineOverride` Add documentation for `Capability` and some other experimental annotations. Tests are updated accordingly. [Cherry-picked f177289][modified]
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Backports #22849 to the 3.7.0-RC2.
PR submitted by the release tooling.