Make YubiKeyDeviceListener resettable

[jamiehankins]

Currently, YubiKeyDeviceListener only exposes a singleton instance with no way for a consumer to reset it once it is started. The constructor is private, so the consumer has no option to use a private instance.

This adds the ability for the consumer to reset the lazy-initialized singleton so that the listen thread doesn't stick around.

Also, even though this class implemented IDisposable, most things that need to be in the Dispose method weren't there, including a way to stop the thread.

The listen thread is now replaced by an asynchronous task that doesn't consume a system thread while it's not working.

Description

Please include a summary of the change and which issue is fixed. Please also include relevant motivation and context. List any dependencies that are required for this change.

Fixes # YESDK-1313

Type of change

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• [x] Bug fix (non-breaking change which fixes an issue)

How has this been tested?

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also list any relevant details for your test configuration

Test configuration:

• Firmware version: 5.4.3
• Yubikey model:

Checklist:

• [ ] My code follows the style guidelines of this project
• [x] I have performed a self-review of my own code
• [ ] I have run dotnet format to format my code
• [x] I have commented my code, particularly in hard-to-understand areas
• [ ] I have made corresponding changes to the documentation
• [x] My changes generate no new warnings
• [ ] I have added tests that prove my fix is effective or that my feature works
• [x] New and existing unit tests pass locally with my changes

[github-actions[bot]]

Test Results: Windows

    2 files      2 suites   2s :stopwatch: 3 615 tests 3 615 :white_check_mark: 0 :zzz: 0 :x: 3 617 runs  3 617 :white_check_mark: 0 :zzz: 0 :x:

Results for commit ce5ddc13.

[github-actions[bot]]

Test Results: Ubuntu

    2 files      2 suites   5s :stopwatch: 3 607 tests 3 607 :white_check_mark: 0 :zzz: 0 :x: 3 609 runs  3 609 :white_check_mark: 0 :zzz: 0 :x:

Results for commit ce5ddc13.

[github-actions[bot]]

Test Results: MacOS

    2 files      2 suites   1s :stopwatch: 3 607 tests 3 607 :white_check_mark: 0 :zzz: 0 :x: 3 609 runs  3 609 :white_check_mark: 0 :zzz: 0 :x:

Results for commit ce5ddc13.

[github-actions[bot]]

Package	Line Rate	Branch Rate	Complexity	Health
Yubico.Core	42%	32%	4245	➖
Yubico.YubiKey	51%	47%	18438	➖
Summary	49% (31665 / 64296)	45% (8014 / 17985)	22683	➖

Minimum allowed line rate is 40%