bugprone-unchecked-optional-access should support user-configurable std::optional-like classes

[carlosgalvezp]

Currently, the check hardcodes the following names for accepted std::optional-like classes:

• std::optional
• absl::optional
• base::Optional

Recently, a patch is adding support for yet another project - folly::Optional.

It would be good to not hardcode these project-specific names inside the source code, and instead make this user-configurable.

[llvmbot]

@llvm/issue-subscribers-clang-tidy