Add Task/AsyncOption defaultValue and defaultWith

[sheridanchris]

Proposed Changes

Add a few Task/AsyncOption functions that exist in the Option module.
Reference: #234 (this PR does not fulfill the Task/AsyncResult part of this issue)

Types of changes

What types of changes does your code introduce to FsToolkit.ErrorHandling?
Put an x in the boxes that apply and remove ones that don't apply

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist

Put an x in the boxes that apply. You can also fill these out after creating the PR. If you're unsure about any of them, don't hesitate to ask. We're here to help! This is simply a reminder of what we are going to look for before merging your code.

• Build and tests pass locally
• I have added tests that prove my fix is effective or that my feature works (if appropriate)
• I have added necessary documentation (if appropriate)

[TheAngryByrd]

Looks great. Mind giving these doc comments too?

[sheridanchris]

Looks great. Mind giving these doc comments too?

Done!