This PR implements RFC #12216: native computation (`native_decide`,
`bv_decide`) is represented in the logic as one axiom per computation,
asserting the equality that was obtained from the native computation.
`#print axiom` will no longer show `Lean.trustCompiler`, but rather the
auto-generated names of these axioms (with, for example,
`._native.bv_decide.` in the name). See the RFC for more information.
This PR introduces a common MetaM helper (`nativeEqTrue`) used by
`native_decide` and `bv_decide` alike that runs the computation and then
asserts the result using an axiom.
It also deprecated the `ofReduceBool` axioms etc.
Not included in this PR is infrastructure for enumerating these axioms,
prettier `#print axioms` (should we want his) and tactic concurrency.
Fixes#12216.
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