Adds Group Component Generation and Quality of Life Changes

[ksiamis-connamara]

This PR is adding the missing support for Group generation for the generated protos. It also some includes some quality of life changes that ensures the generated protos can be use with protoc for generated source files in various languages

• Adds the generation of Groups to proto files
• Fixes Enum Duplications that can occur on a deprecated enum and unspecified enum by including a suffix
• Adds FIX Latest enum option to the FIX Version Enum
• Moves common message item processing logic to single private method to reduce maintenance and potential bug spots by changing one spot and not the other
• Moves all generated enums into fix.proto file (or alternate package when defined) to remove all circular references inside the generated protos

[ksiamis-connamara]

@donmendelson If we can get some eyes on this that would be great. This is related to some additional changes @mgatny PR'd in https://github.com/FIXTradingCommunity/fix-orchestra-protobuf/pull/13