support gcobol

[GitMensch]

For the LSP that shouldn't make such a big difference for now (you may add a dialect option gcc-cobol / gcc-cobol-mf / gcc-cobol-ibm or similar later, which has a different set of reserved words - but using the gc ones matching the dialect should be fine.

For the extension itself - one could either use the GnuCOBOL build - but defining the cobc binary as gcobc (a wrapper around gcobol), or actually provide a template for gcobol compilation. The coverage option would be identical --coverage and displaying the result should still be identical.

The pattern matchers for the diagnostic are likely different (sarif format or similar would also be possible - gcobol now provides clear ranges, including columns), but adding a gcc one (that's in general) or, to prevent name conflicts, gcobol one shouldn't be hard.

Debugging could be explicit defined as "for now only GnuCOBOL 3.2+ is supported", and if the debugging extension would be split out it could be possible to just use a common debug extension like native-debug (with a most updated GDB containing the necessary parts, of course).