feat(alerts): get metric dimensions from blueprint

[roleyfoley]

Description

Adds support for explicit alert metric dimensions defined as part of settings or solution configuration

Motivation and Context

When monitoring systems its common to create your own metrics based on business data which are stored in your monitoring system. This allows you to generate alarms on system infrastructure and business related events. Currently our alert support would only allow for defining metric dimensions based on component resources. As a result of this you couldn't create alerts based on business metrics which don't map to resources

How Has This Been Tested?

Tested locally

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• Refactor (non-breaking change which improves the structure or operation of the implementation)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Followup Actions

• None

Checklist:

• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.
• None of the above.

[RossMurr4y]

Looks good, just the one typo to fix up but otherwise happy