[WIP] More templates for the classes derived from SPOSetT<T>

[ylee88]

Proposed changes

Introducing templates for the classes derived from SPOSetT<T>. This is the following change towards a unified build for real, complex, and mixed-precision, starting from #5306.

What type(s) of changes does this code introduce?

• Code style update (formatting, renaming)
• Refactoring (no functional changes, no api changes)

Does this introduce a breaking change?

• No

What systems has this change been tested on?

Checklist

• Yes. This PR is up to date with current the current state of 'develop'
• Yes/No. Code added or changed in the PR has been clang-formatted
• No. This PR adds tests to cover any new code, or to catch a bug that is being fixed
• No. Documentation has been added (if appropriate)

[ye-luo]

Could you make a new PR by cherry-picking ConstantSPOSet, CompositeSPOSet and DummySPOSetWithMW changes. DummySPOSetWithoutMW was removed earlier. Basically leaving out RotatedSPO.

[ylee88]

@ye-luo I still see DummySPOSetWithoutMW in the develop branch:

qmcpack/src/QMCWaveFunctions/tests/test_RotatedSPOs.cpp

Line 839 in 094b0c8

class DummySPOSetWithoutMW : public SPOSet

Is there a pending PR removing that?

[ylee88]

A subset of this PR superseded in #5373.

[ye-luo]

This PR is stalled due to the need of clean up ParticleSet, it should not carry wavefunction related objects like P.G/P.L.