Feature:(Issue 1334) Add support for uint64slices

[dearchap]

What type of PR is this?

• feature

What this PR does / why we need it:

Add support for uint64 slices

Which issue(s) this PR fixes:

Special notes for your reviewer:

Please focus on altsrc changes as well, especially the type switch

Testing

Ran unit tests

Release Notes

Add support for uint64slice flag 

[meatballhat]

@dearchap Are you up for addressing the conflicts and getting the test coverage above the threshold? No worries if not. I'm happy to take this work to completion.

[dearchap]

@meatballhat Let me take a look

[dearchap]

@meatballhat Done. Can you take a look ?

[dearchap]

@meatballhat Can you take a look at why tests are failing ? I dont quite understand why.

[meatballhat]

@dearchap looks like tests are happy now -- coverage thresholds are still grumpy, but I don't want to be draconian about those checks. Maybe add some coverage threshold wiggle room as part of this PR? e.g.:

# in .github/codecov.yml
coverage:
  threshold: 5%

[dearchap]

@meatballhat I update the coverage threshold but it still fails. Can you approve and merge ?

[Dokiys]

@meatballhat Can you take a look at why tests are failing ? I dont quite understand why.

@dearchap codecov will use the coverage from the base commit. Checks show target coverage need 83.22. You can try this specify a target. Would 5% be too low? I feel more coverage can reduce review time.

[dearchap]

@meatballhat I've fixed the codecov issues. I'm going to merge.