Support new runtime with nim-gdb (#21400)

* Add support for orc strings

* Cleaned up testing script

Enums now printing properly

Merged both old and new strings into the one printer

Moving onto sets which seem kinda difficult

* Sets working

Instead of trying to imitate how Nim represents enums, I just call the dollar proc for each enum value

While this runs into problems if the user doesn't call the dollar proc anywhere, I believe its a decent tradeoff

I've cleaned up the error message for when it cannot find dollar proc (Might add in proper message on how to fix)

* Support sequences

V2 runtime seems to have sequences that don't have a len (Guessing its some kind of short seq optimisation?) but I've rolled
the implementation into normal sequences since the implementation is practically the same

* Clean up test program so it isn't using diff

Also don't redirect the first nim compile to /dev/null so that we can check for any compilation errors

I found the diff to be annoying to read (Seeing as the test script already performs diffing)

* Tables are now supported

* Add colours to test output

It was getting difficult to tell apart test output from GDB output so I added colour to better tell them apart

* Both old and new runtime are working

Set exit code in python test script so that this could possibly be added to the CI. Only issue is that it can be flaky (GDB crashes randomly for some reason)

* Remove old code that was commented out

If I need it later I'll just use git

* Remove branch that never runs

* Remove the old test output [skip ci]

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