Rollup merge of #97450 - c410-f3r:assert-compiler, r=oli-obk

[RFC 2011] Basic compiler infrastructure

Splitting https://github.com/rust-lang/rust/pull/96496 into smaller pieces as was done in https://github.com/rust-lang/rust/pull/97233. Hope review will be easier.

This PR practically contains no logic and only serves as a building ground for the actual code that will be placed in a posterior step.

* Adds `context.rs` to place the new `assert!` logic. Has a lot of unused elements but all of them are used by the implementation.
* Creates an unstable flag because the feature is not yet complete and also to allow external feedback.
* Creates the necessary `sym` identifiers that are mostly based on the library elements -> https://github.com/rust-lang/rust/blob/master/library/core/src/asserting.rs
* Modifies `assert.rs` to branch to `context.rs` if the unstable flag is enabled.
* Adds a test to satisfy tidy but the test does nothing in reality.

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