[Coverage] Introduce the type `CounterPair` for RegionCounterMap. NFC. (#112724) `CounterPair` can hold `<uint32_t, uint32_t>` instead of current `unsigned`, to hold also the counter number of SkipPath. For now, this change provides the skeleton and only `CounterPair::Executed` is used. Each counter number can have `None` to suppress emitting counter increment. 2nd element `Skipped` is initialized as `None` by default, since most `Stmt*` don't have a pair of counters. This change also provides stubs for the verifier. I'll provide the impl of verifier for `+Asserts` later. `markStmtAsUsed(bool, Stmt*)` may be used to inform that other side counter may not emitted. `markStmtMaybeUsed(S)` may be used for the `Stmt` and its inner will be excluded for emission in the case of skipping by constant folding. I put it into places where I found. `verifyCounterMap()` will check the coverage map and the counter map, and can be used to report inconsistency. These verifier methods shall be eliminated in `-Asserts`. https://discourse.llvm.org/t/rfc-integrating-singlebytecoverage-with-branch-coverage/82492
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