async password validation

[conradludgate]

Problem

password hashing can block main thread

Summary of changes

spawn_blocking the password hash call

Checklist before requesting a review

• I have performed a self-review of my code.
• If it is a core feature, I have added thorough tests.
• Do we need to implement analytics? if so did you add the relevant metrics to the dashboard?
• If this PR requires public announcement, mark it with /release-notes label and add several sentences in this section.

Checklist before merging

• Do not forget to reformat commit message to not include the above checklist

[github-actions]

2700 tests run: 2568 passed, 0 failed, 132 skipped (full report)

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Code coverage* (full report)

• functions: 28.3% (7132 of 25170 functions)
• lines: 46.9% (43712 of 93291 lines)

* collected from Rust tests only

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_{The comment gets automatically updated with the latest test results
b934c37 at 2024-03-18T21:25:04.098Z :recycle:}