Refactor Message for better type safety

[github-actions]

• Potentially refactor to individual enums for better case exhaustiveness, covering the cases below...
  • success, error
  • request, response
  • server, client
• Maybe make a macro that casts a Body::Message based on Body::Type
• Add a macro for simply defining messages

core/src/placeos-edge/protocol.cr

Lines 93 to 99 in b938d43

	# TODO: Refactor Message for better type safety
	# - Potentially refactor to indivual enums for better case exhaustiveness
	# - success, error
	# - request, response
	# - server, client
	# - Maybe make a macro that casts a Body based on `Body::Type`
	# - Add a macro for simply defining messages