* Boilerplate for new context menu options
* Enables checkmarks for expensive operator context menu actions
* Updates azdataGraph version to 0.0.44
* Adds clearing logic to actions and retrieves additional info from nodes
* Removes unnecessary actions that aren't supported by other providers
* Finishes setting up the rest of the context menu actions
* Corrects context menu action label
* Defines new widget type for finding expensive operations
* Adds TODO for class icon name
* Creates action to open the expensive operation widget
* Adds escape and enter key shortcuts to findExpensiveOperation widget
* Styles find expensive operation widget
* Corrects class name for finding expensive operator action
* Corrects import statement.
* Code clean up
* Bumps azdataGraph version to 0.0.45
* Adds an info box for when a metric doesn't find any nodes
* Adds label to find expensive operator widget
* Invokes dispose when widget controller removes widget
* Implements disposable in all execution plan widgets.
* Adds off action to clear highlighting
* Adds a default setting and default prompt for highlighting metric
* Fixes not all code paths return error
* Removes shortcut key from text for widget actions
* Adds enum description
* Removes added dictionary type, and renames class name
* Removes unnecessary null checks
* Removes cost metric dictionary and adds corresponding properties
* Code review changes
* Removes incorrectly implemented key down event for widget.
* Renames widget and action class names for highlighting expensive ops
* File rename
* Cleans up labels to better reflect highlight action
* Removes hardcoded button width style and sets it to auto
* More clean up
* Clean up import statement
* Code review changes
* Drop down list only shows available metrics
* Updates highlight expensive operation icon
* Update STS version
* Fixes incorrect label when plans are vertical
* Code review changes.
* Adds helper methods to get localized strings
* Helper functions moved to module level
* Renames fields from top and bottom to primary and secondary
* fixing icons for new ledger object SubTypes
* removing irrelevant context menu options from ledger objects in OE
* aligning LedgerDropped subtype context key specifically with the Table NodeType context key
* Adds find node button to comparison plans.
* Can search multiple nodes (improve widget UI and initialization)
* Adjusts how second plan is added to the node search widget
* Adds styling to the find node action bar
* Removes unused code
* Minor clean up
* Cleans up CSS redundancy
* Adjusts property names according to access specifiers
* Corrects find node behavior to match SSMS
* Dependency injects instantiation service
* Adds additional property to telemetry event.
* Adds undefined to getter return signatures for plans
* Adds checks around active execution plan properties
* Code review change
* Code review changes
