Ability to extend telemetry events

[cxbuilders]

It would be great to have the possibility to define additional custom customDimensions. Now I submit a custom telemetry event with the custom dimensions and in Application Insights it takes a lot of effort to tie all events together to teh one with the custom Dimensions based on the conversation ID.

Having the ability to predefine custom Dimensions (like =user.username etc) that would be submitted for all (standard and custom) telemetry events would be great for getting much more out of reporting.

We use composer to build bots, so having somewhere in the bot settings the possibility to add those custom Dimensions, just like one would for adding a custom telemetry event, would be an easy way to tailor a bot for more specific reporting.

[DeependraKhangarot]

This will help in standardizing the practice to log minimal properties and then the user can add more as needed.