[clang-format] Allow configuring list of function-like macros that resolve to a type

Summary:
Adds a TypenameMacros configuration option that causes certain identifiers to be handled in a way similar to typeof().

This is enough to:

• Prevent misinterpreting declarations of pointers to such types as expressions (STACK_OF(int) * foo -> STACK_OF(int) *foo),
• Avoid surprising line breaks in variable/struct field declarations (STACK_OF(int)\nfoo; -> STACK_OF(int) foo;, see https://bugs.llvm.org/show_bug.cgi?id=30353).

Reviewers: Typz, krasimir, djasper

Reviewed By: Typz

Subscribers: cfe-commits

Tags: #clang

Differential Revision: https://reviews.llvm.org/D57184