Update Catch 2 to a v3 version

[alkino]

A lot of changes are needed because they break how catch2 from v2 to v3.
First of all, this is no more header-only but as a static library now.
Headers are split for compilation speed.

[iomaganaris]

Just something I quickly noticed. Should the function table changes be in separate PR?

[olupton]

I didn't spot anything in the diff, but the failing CI needs to be understood...

[olupton]

I didn't spot anything in the diff, but the failing CI needs to be understood...

(Slack is down)
I believe the problem with the CI is that your Spack branch makes nmodl@develop depend on catch2@3, but this conflicts with libsonata requiring catch2@2, so nmodl@develop is not used (even though it is marked as preferred) and we do not get the changes from this PR.
cc: @iomaganaris @alkino

[codecov]

Codecov Report

Merging #973 (7971732) into master (6825acd) will increase coverage by 0.02%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #973      +/-   ##
==========================================
+ Coverage   69.93%   69.95%   +0.02%     
==========================================
  Files         188      188              
  Lines       25639    25639              
==========================================
+ Hits        17931    17937       +6     
+ Misses       7708     7702       -6     

Impacted Files	Coverage Δ
...est/unit/codegen/codegen_compatibility_visitor.cpp	100.00% <ø> (ø)
test/unit/codegen/codegen_helper.cpp	100.00% <ø> (ø)
test/unit/codegen/codegen_utils.cpp	100.00% <ø> (ø)
test/unit/codegen/main.cpp	100.00% <ø> (ø)
test/unit/codegen/transform.cpp	100.00% <ø> (ø)
test/unit/crout/crout.cpp	88.88% <ø> (ø)
test/unit/lexer/tokens.cpp	100.00% <ø> (ø)
test/unit/modtoken/modtoken.cpp	100.00% <ø> (ø)
test/unit/printer/printer.cpp	100.00% <ø> (ø)
test/unit/units/lexer.cpp	100.00% <ø> (ø)
... and 32 more

[alkino]

Alléluïa
So what next?
Merging the spack changes?

[bbpbuildbot]

Logfiles from GitLab pipeline #125202 (:white_check_mark:) have been uploaded here!

Status and direct links:

• ✅ spack_setup
• ✅ build:intel
• ✅ build:nvhpc
• ✅ test:intel
• ✅ test:nvhpc