tools: add missing STL includes for Windows/clang-cl (bugfix)

[nathandelisle]

part of #95

Building the tools/ targets on Windows with LLVM clang-cl fails due to missing STL headers (that Linux setups probably get transitively)

This PR adds includes where symbols are used, no behavior change

[Cyan4973]

It's interesting that the current CI test suite did not catch this issue, even though it's supposed to have cmake on windows build tests. What could be missing ?

[nathandelisle]

hm, I took a look at workflows/windows-ci.yml:
cmake --build . --config ${{ matrix.config }} --target openzl --verbose
looks like only openzl is built? so perhaps tools_io, tools_training, cli/zli are not built on the Windows job?

[Cyan4973]

Don't worry about clang-format, we'll take care of it.

There is now a corresponding test in #99 .

I'll check that this PR does fix the failing test, as expected, and merge them.

[Cyan4973]

So, #96 has been integrated into #99 (with clang-format fixed).

Unfortunately, it fails at fixing all the compilation issues.

But maybe #97 is also necessary for all Windows compilations to become successful ?