Problem: memiavl restore fail to reopen the db

[yihuang]

Solution:

• grab the file lock before restoration starts, to prevent multiple concurrent restorations.
• close the db before doing the restoration.
• reproduce the issue in integration test.

👮🏻👮🏻👮🏻 !!!! REFERENCE THE PROBLEM YOUR ARE SOLVING IN THE PR TITLE AND DESCRIBE YOUR SOLUTION HERE !!!! DO NOT FORGET !!!! 👮🏻👮🏻👮🏻

PR Checklist:

• Have you read the CONTRIBUTING.md?
• Does your PR follow the C4 patch requirements?
• Have you rebased your work on top of the latest master?
• Have you checked your code compiles? (make)
• Have you included tests for any non-trivial functionality?
• Have you checked your code passes the unit tests? (make test)
• Have you checked your code formatting is correct? (go fmt)
• Have you checked your basic code style is fine? (golangci-lint run)
• If you added any dependencies, have you checked they do not contain any known vulnerabilities? (go list -json -m all | nancy sleuth)
• If your changes affect the client infrastructure, have you run the integration test?
• If your changes affect public APIs, does your PR follow the C4 evolution of public contracts?
• If your code changes public APIs, have you incremented the crate version numbers and documented your changes in the CHANGELOG.md?
• If you are contributing for the first time, please read the agreement in CONTRIBUTING.md now and add a comment to this pull request stating that your PR is in accordance with the Developer's Certificate of Origin.

Thank you for your code, it's appreciated! :)

[codecov]

Codecov Report

Merging #1130 (78366c6) into main (ee517d8) will increase coverage by 23.22%.
The diff coverage is 66.66%.

@@             Coverage Diff             @@
##             main    #1130       +/-   ##
===========================================
+ Coverage   22.92%   46.14%   +23.22%     
===========================================
  Files          47       82       +35     
  Lines        3089     7461     +4372     
===========================================
+ Hits          708     3443     +2735     
- Misses       2311     3652     +1341     
- Partials       70      366      +296     

Files Changed	Coverage Δ
memiavl/import.go	64.64% <66.66%> (ø)

... and 49 files with indirect coverage changes