Print block and warmup timings

[prckent]

Proposed changes

Improve progress monitoring by printing timings for warmup and blocks. Block timing and elapsed time given for first, last, and every ~25% progress. Max 5 timing lines printed.

Also changed output "End of a QMC block" to "End of a QMC section" for clarity.

Sample output:

658: VMC Warmup completed in 2.3138e-02 secs
658: =====================================================
658: --- Memory usage report : VMCBatched after Warmup ---
658: =====================================================
658: Available memory on node 0, free + buffers :   27749 MiB
658: Memory footprint by rank 0 on node 0       :     122 MiB
658: =====================================================
658: Completed block    1 of 100 average 0.01264 secs/block after 19.97 secs
658: Completed block   26 of 100 average 0.01644 secs/block after 20.39 secs
658: Completed block   51 of 100 average 0.01398 secs/block after 20.68 secs
658: Completed block   76 of 100 average 0.01492 secs/block after 21.1 secs
658: Completed block  100 of 100 average 0.01527 secs/block after 21.49 secs
658: ====================================================
658:   End of a VMC section
658:     QMC counter        = 5
658:     time step          = 0.5

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

• New feature

Does this introduce a breaking change?

• No

What systems has this change been tested on?

Laptop ubuntu 22 clang 15

Checklist

• 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
• 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]

Test this please