Add architecture override option to Update command

[ryfu-msft]

Resolves #198

This PR addresses issues that some users have been having with the update command detecting the wrong architecture from the installers they provide when trying to use the update command. This discrepancy is often seen in nullsoft installers, which are detected to be x86 based off their installer executables, even if they install a x64 application.

To resolve this, we added the ability for users to append the overriding architecture to the end of the installerURL they are updating with. The architecture must be separated by the '|' character with no spaces.

Example (overriding x64 installer with x86):
wingetcreate update -u https://foobar_x64_installer.exe|x86

Changes:

• Adds an example to the UpdateCommand on how to use the architecture override.
• Add functionality for parsing installerUrls for architecture overrides by splitting based on the '|' character.
• Matching new installers to existing installers now first checks if a match can be found by comparing the installerType and the new overriding architecture. If no match can be found, then the architecture detected from the url string or the binary are used instead. If both of these comparisons fail, a matching error is shown to the user.
• Refactor matching logic into separate method called FindInstallerMatch().

Testing:
Added 5 unit tests to verify the functionality of this new features:

• Verifies that invalid architecture specified for override shows error message
• Verifies that multiple architectures specified for override shows error message
• Verifies update command succeeds with an overriding architecture specified that matches an existing installer
• Verifies the update command succeeds if the overriding architecture fails to match, but the url and binary detection does find a match to an existing installer.
• Verifies that failing a match when updating with an architecture override shows a warning message to the user.

Microsoft Reviewers: Open in CodeFlow

[palenshus]

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revoking review

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