Unify method pairs with and without Type param (#6184)

As suggested in
https://github.com/WebAssembly/binaryen/pull/6181#discussion_r1427188670,
using `std::optional<Type>`, this unifies two different versions of
`make***`, for  block-like structures (`block`, `if`, `loop`, `try`, and
`try_table`) with and without a type parameter.

This also allows unifying of `finalize` methods, with and without a
type. This also sets `breakability` argument of `Block::finalize` to
`Unknown` so we can only have one `Block::finalize` that handles all
cases.

This also adds an optional `std::optional<Type> type` parameter to
`blockifyWithName`, and `makeSequence` functions in `wasm-builder.h`.
blockify was not included because it has a variadic parameter.

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