Initial implementation of nimsuggest v3 (#19826) [backport]

[yyoncho]

• Initial implementation of nimsuggest v3

Rework nimsuggest to use caching to make usage of ide commands more efficient.
Previously, all commands no matter what the state of the process is were causing
clean build. In the context of Language Server Protocol(LSP) and lsp clients
this was causing perf issues and overall instability. Overall, the goal of v3 is
to fit to LSP Server needs

• added two new commands:

  • recompile to do clean compilation
  • changed which can be used by the IDEs to notify that a particular file has been changed.
    The later can be utilized when using LSP file watches.
  • globalSymbols - searching global references

• added segfaults dependency to allow fallback to clean build when incremental
  fails. I wish the error to be propagated to the client so we can work on fixing
  the incremental build failures (typically hitting pointer)

• more efficient rebuild flow. ATM incremental rebuild is triggered when the
  command needs that(i. e. it is global) while the commands that work on the
  current source rebuild only it

Things missing in this PR:

• Documentation
• Extensive unit testing.

Although functional I still see this more as a POC that this approach can work.

Next steps:

• Implement sug request.
• Rework/extend the protocol to allow better client/server communication.
  Ideally we will need push events, diagnostics should be restructored to allow
  per file notifications, etc.
• implement v3 test suite.
• better logging

• Add tests for v3 and implement ideSug

• Remove typeInstCache/procInstCache cleanup

• Add ideChkFile command

• Avoid contains call when adding symbol info

• Remove log

• Remove segfaults