New Telemetry Support for Luis Recognizer

[daveta]

Adds support for IBotTelemetryClient (no new dependencies) within the Luis Recognizer.

https://github.com/daveta/analytics/blob/master/telemetry_enhancements/TelemetryEnhancements.md#telemetry-support-luis

• Properties can be added to the telemetry event per invocation
• Class can be derived to override default behavior
• Exposed methods to help populate events when deriving

[coveralls]

Pull Request Test Coverage Report for Build 51480

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 45 unchanged lines in 2 files lost coverage.
• Overall coverage increased (+0.3%) to 74.866%

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Files with Coverage Reduction	New Missed Lines	%
/libraries/integration/Microsoft.Bot.Builder.Integration.AspNet.Core/BotFrameworkHttpAdapter.cs	3	66.67%
/libraries/Microsoft.Bot.Builder.AI.LUIS/LuisRecognizer.cs	42	71.52%

Totals
Change from base Build 50252:	0.3%
Covered Lines:	4188
Relevant Lines:	5594

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💛 - Coveralls

[johnataylor]

could these be static readonly? (i.e. do you ever use then in a switch-case statement?)

[daveta]

Thanks @johnataylor!
@ryanlengel mentioned some impending requests from customers - waiting until he gets back today to see what those are..

[ryanisgrig]

@daveta I added comments to #1430 - they are related to the LUIS recognizer but the changes necessary are in QnA