fix: Use consistent CMake settings for all modules (#5228)

* Resolves an issue introduced in #5111, which inadvertently removed the
  -Wno-maybe-uninitialized compiler option from some xrpl.libxrpl
  modules. This resulted in new "may be used uninitialized" build
  warnings, first noticed in the "protocol" module. When compiling with
  derr=TRUE, those warnings became errors, which made the build fail.
* Github CI actions will build with the assert and werr options turned
  on. This will cause CI jobs to fail if a developer introduces a new
  compiler warning, or causes an assert to fail in release builds.
* Includes the OS and compiler version in the linux dependencies jobs in
  the "check environment" step.
* Translates the `unity` build option into `CMAKE_UNITY_BUILD` setting.

.github/workflows/nix.yml

@@ -68,6 +68,8 @@ jobs:
       - name: check environment
         run: |
           echo ${PATH} | tr ':' '\n'
+          lsb_release -a || true
+          ${{ matrix.profile.cc }} --version
           conan --version
           cmake --version
           env | sort