[clang-format] Parse Verilog if statements

This patch mainly handles treating `begin` as block openers.

While and for statements will be handled in another patch.

Reviewed By: HazardyKnusperkeks

Differential Revision: https://reviews.llvm.org/D123450

NOKEYCHECK=True
GitOrigin-RevId: 9ed2e68c9ae5cf346f938cc095e5448c1ff60f51
1 file changed