New diagnostics output format for CLI

[fm-117]

Currently 2 formats are supported by CLI :

• txt is the default format, it is designed for humans and describes diagnostics in plain strings
• xml is an alternate format designed for RdZ (as a preprocessor format)

Those 2 formats do not contain all information as opposed to LSP format so the goal of this issue is to create a third format for CLI.

Here is a proposal, in XML:

<build return-code="ParsingDiagnostics">
  <filetable>
    <file index="1" path="C:\Users\UserName\Documents\cobol\test.tcbl" />
  </filetable>
  <diagnostics>
    <diagnostic file-index="1">
      <range line-start="4" column-start="20" line-end="4" column-end="23" />
      <message>Semantic error: Symbol var1 is not referenced</message>
      <info severity="Error" code="30" source="" />
    </diagnostic>
  </diagnostics>
</build>

• it is a mix between current xml format and data from LSP diagnostic model
• each diagnostic is associated to a file using a file-index attribute to support multifile parsing scenarios
• all fields from LSP Diagnostic class are serialized
• for quality rules violations, code is set to 47 and source will contain the rule identifier