Use HDF5 1.10 API

[quantumsteve]

Please review the developer documentation
on the wiki of this project that contains help and requirements.

Proposed changes

Describe what this PR changes and why. If it closes an issue, link to it here
with a supported keyword.

Move QMCPACK to use the HDF5 1.10 API, released in 2016. 1.10 is available starting in Ubuntu 18.04 and RHEL 8 The 1.8 and 1.12 branches have their final patch releases in January 2023, so 1.10 seems to be the sweet spot.

I think this flag in 1.8 will let us use a longer std::string instead of std::vector<std::string> in ObservableHelper.

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

Delete the items that do not apply

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

Does this introduce a breaking change?

• No (might if we use HDF5 1.8+ features in hdf5 output)

What systems has this change been tested on?

my laptop, Ubuntu 20.04

Checklist

Update the following with a yes where the items apply. If you're unsure about any of them, don't hesitate to ask. This is
simply a reminder of what we are going to look for before merging your code.

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

[prckent]

Following our 2 year rule, it is more than timely to require 1.10

Please also update https://github.com/QMCPACK/qmcpack/blob/develop/README.md

[ye-luo]

Test this please