[clang-tidy] Let misc-const-correctness detect auto local variables that can be made const

[PiotrZSL]

• Failed tests
• Missing tests for this change
• Missing configuration option for this change (changing default behavior)
• Missing release notes
• Missing documentation update
• auto& , auto&&, auto* still wont be ignored (that's also auto type).

[ChrisThrasher]

I'm working on the test failures and improved test coverage. Where can I learn more about how to update the release notes and documentation?

[PiotrZSL]

Tests:
./clang-tools-extra/test/clang-tidy/checkers/misc/const-correctness-transform-values.cpp
./clang-tools-extra/test/clang-tidy/checkers/misc/const-correctness-cxx17.cpp
./clang-tools-extra/test/clang-tidy/checkers/misc/const-correctness-templates.cpp
./clang-tools-extra/test/clang-tidy/checkers/misc/const-correctness-transform-pointer-as-values.cpp
./clang-tools-extra/test/clang-tidy/checkers/misc/const-correctness-unaligned.cpp
./clang-tools-extra/test/clang-tidy/checkers/misc/const-correctness-pointer-as-values.cpp
./clang-tools-extra/test/clang-tidy/checkers/misc/const-correctness-values.cpp
./clang-tools-extra/test/clang-tidy/checkers/misc/const-correctness-wrong-config.cpp

Documentation:
./clang-tools-extra/docs/clang-tidy/checks/misc/const-correctness.rst

Release notes:
./clang-tools-extra/docs/ReleaseNotes.rst

For things like options, look how other checks do that.

[cjdb]

Would you be able to update the commit message to include a description that explains why this commit is necessary please?

clang-tools-extra/clang-tidy/misc/ConstCorrectnessCheck.cpp

void ConstCorrectnessCheck::registerMatchers(MatchFinder *Finder) {
   const auto TemplateType = anyOf(
       hasType(hasCanonicalType(templateTypeParmType())),
       hasType(substTemplateTypeParmType()), hasType(isDependentType()),
       // References to template types, their substitutions or typedefs to
       // template types need to be considered as well.
       hasType(referenceType(pointee(hasCanonicalType(templateTypeParmType())))),
       hasType(referenceType(pointee(substTemplateTypeParmType()))));
 
-  const auto AutoTemplateType = varDecl(
-      anyOf(hasType(autoType()), hasType(referenceType(pointee(autoType()))),
+  const auto AutoTemplateType =
+      varDecl(anyOf(hasType(referenceType(pointee(autoType()))),
                     hasType(pointerType(pointee(autoType())))));
 
   const auto FunctionPointerRef =
       hasType(hasCanonicalType(referenceType(pointee(functionType()))));
 
   // Match local variables which could be 'const' if not modified later.
   // Example: `int i = 10` would match `int i`.
   const auto LocalValDecl = varDecl(
       allOf(isLocal(), hasInitializer(anything()),