Added Catch v3 support

[xvitaly]

Added Catch v3 support with backward compatibility with Catch v2.

[gabime]

Thanks. I prefer to keep it simpler by just upgrading the bundled version to catch3. If this works with current tests, we can avoid any cmake changes and ifdefs.

[xvitaly]

If this works with current tests, we can avoid any cmake changes and ifdefs.

It builds, but the tests fails:

Test project /builddir/build/BUILD/spdlog-1.11.0/redhat-linux-build
    Start 1: spdlog-utests
1/1 Test #1: spdlog-utests ....................Subprocess aborted***Exception:   0.07 sec
spdlog-utests: src/catch2/catch_test_case_info.cpp:147: Catch::TestCaseInfo::TestCaseInfo(Catch::StringRef, const Catch::NameAndTags&, const Catch::SourceLineInfo&): Assertion `inTag' failed.


0% tests passed, 1 tests failed out of 1

Also catch3 is no longer a header-only library. It need to be compiled first.

[xvitaly]

https://github.com/catchorg/Catch2/blob/devel/docs/migrate-v2-to-v3.md

[gabime]

So I think we need to use their recommended approach #2

[xvitaly]

So I think we need to use their recommended approach 2

I will update my PR.

[xvitaly]

Done. It will use FetchContent() for fetching catch.

[xvitaly]

Missing Git on CI. I will add it.

[gabime]

@xvitaly Sorry, I had to revert this pr, it doens't pass the CI. I realized this only after the merge. Feel free to fix and open new PR.

[xvitaly]

I had to revert this pr, it doens't pass the CI. I realized this only after the merge

#2659 will prevent issues like this from happening in the future.