[lldb-dap] Creating well defined structures for DAP messages. (#129155)
This adds a new `Protocol.{h,cpp}` for defining structured types that
represent Debug Adapter Protocol messages.
This adds static types to define well structure messages for the
protocol. This iteration includes only the basic `Event`, `Request` and
`Response` types.
These types help simplify and improve the validation of messages and
give us additional static type checks on the overall structure of DAP
messages, compared to today where we tend to use `llvm::json::Value`
directly.
In a follow-up patch I plan on adding more types as need to allow for
incrementally migrating raw `llvm::json::Value` usage to well defined
types.
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Co-authored-by: Adrian Vogelsgesang <adrian.vogelsgesang@tum.de>
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