Opentelemetry exporter for Azure Monitor December 2020 release

[rakshith91]

• Port track1 export/ functionality to track2 #14273
• Write E2E samples for track2 exporter  #14272
• monitor exporter - port exporter related tests to track2 from track 1 #14271
• Setup live tests for Opentelemtry Exporter for Azure monitor #14274

[rakshith91]

released beta1https://pypi.org/project/microsoft-opentelemetry-exporter-azuremonitor/