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[Stretch] Add `stretch` variable support to `QuantumCircuit`. (#13852)

* WIP

* Add try_const to lift.

* Try multiple singletons, new one for const.

* Revert "Try multiple singletons, new one for const."

This reverts commit e2b322125.

* Remove Bool singleton test.

* Add const handling for stores, fix test bugs.

* Fix formatting.

* Remove Duration and Stretch for now.

* Cleanup, fix const bug in index.

* Fix ordering issue for types with differing const-ness.

Types that have some natural order no longer have an ordering
when one of them is strictly greater but has an incompatible
const-ness (i.e. when the greater type is const but the other
type is not).

* Fix QPY serialization.

We need to reject types with const=True in QPY until it supports them.

For now, I've also made the Index and shift operator constructors
lift their RHS to the same const-ness as the target to make it
less likely that existing users of expr run into issues when
serializing to older QPY versions.

* Make expr.Lift default to non-const.

This is probably a better default in general, since we
don't really have much use for const except for timing
stuff.

* Revert to old test_expr_constructors.py.

* Make binary_logical lift independent again.

Since we're going for using a Cast node when const-ness
differs, this will be fine.

* Update tests, handle a few edge cases.

* Fix docstring.

* Remove now redundant arg from tests.

* Add const testing for ordering.

* Add const tests for shifts.

* Add release note.

* Add const store tests.

* Address lint, minor cleanup.

* Add Float type to classical expressions.

* Allow DANGEROUS conversion from Float to Bool.

I wasn't going to have this, but since we have DANGEROUS
Float => Int, and we have Int => Bool, I think this makes the
most sense.

* Test Float ordering.

* Improve error messages for using Float with logical operators.

* Float tests for constructors.

* Add release note.

* Add D... (continued)

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