(#3193) Add ability to ignore current http cache

[AdmiringWorm]

Description Of Changes

The changes here will add a global option that can be used
by the user to ignore any existing http cache that has been
created prior to the execution of the current command.

Using the option will still create a new cache for the running
execution and reuse that created cache in the current context,
and can be reused normally when not using the argument in the
future.

Motivation and Context

To give the user the ability to bypass the cache when needed, as well as being able to bypass the cache in other products we have.

Testing

1. Run choco outdated (To generate an up to date cache)
2. Open up fiddler
3. Run choco outdated --ignore-http-cache
4. Verify requests are sent out for each package.
5. Remove items in the folders C:\ProgramData\ChocolateyHttpCache and C:\Users\<YOUR_USERNAME>\.chocolatey\http-cache
6. Run choco outdated --ignore-http-cache (To ensure that cache is created again, but from this call).
7. Open up fiddler/clear requests in fiddler.
8. Run choco outdated
9. Verify no requests was sent out through fiddler.
10. Repeat previous steps using choco search chocolatey instead of choco outdated.

Operating Systems Testing

• Windows 10

Change Types Made

• Bug fix (non-breaking change).
• Feature / Enhancement (non-breaking change).
• Breaking change (fix or feature that could cause existing functionality to change).
• Documentation changes.
• PowerShell code changes.

Change Checklist

• Requires a change to the documentation.
• Documentation has been updated.
• Tests to cover my changes, have been added.
• All new and existing tests passed?
• PowerShell code changes: PowerShell v2 compatibility checked?

Related Issue

Fixes #3193

[gep13]

LGTM!