Reduce clang-tidy errors and warnings

[tusharpm]

Problem:

• the following error is reported because clang-tidy doesn't include inline namespaces in the qualified name:

test/ut/ut.cpp:286:21: error: static_assert expression is not an integral constant expression [clang-diagnostic-error]
      static_assert("void"sv ==
                    ^
/Users/runner/work/ut/ut/build/../include/boost/ut.hpp:234:12: note: cannot refer to element 70 of array of 63 elements in a constant expression
  return {&__PRETTY_FUNCTION__[70], sizeof(__PRETTY_FUNCTION__) - 72};

• clang-tidy reports the following warnings:

include/boost/ut.hpp:263:3: warning: multiple declarations in a single statement reduces readability [readability-isolate-declaration]

include/boost/ut.hpp:285:19: warning: do not declare C-style arrays, use std::array<> instead [modernize-avoid-c-arrays]

Solution:

• Add preprocessor check for __clang_analyzer__ and reduce prefix length by 13 for the two inline namespaces (::ext, ::v1_1_8.
• Replace C-style arrays with std::array. Refactor math::num and printer::color to remove array usage.
• Separate multiple variable declarations to individual statements.

Issue: #423

Reviewers:
@krzysztof-jusiak

[kris-jusiak]

Thanks @tusharpm