Upgrade open telemetry package dependencies for Azure Monitor OpenTelemetry Exporter

[vishweshbankwar]

1. Upgrading OpenTelemetry to use 1.1.0-beta4
2. Updgrading OpenTelemetry.Extensions.Hosting, OpenTelemetry.Instrumentation.AspNetCore and OpenTelemetry.Instrumentation.Http to 1.0.0-rc5

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[rajkumar-rangaraj]

/check-enforcer override

[reyang]

@pakrym what's the recommended practice for integration with the upcoming release of OpenTelemetry?

1. Create a separate branch? (any branching naming rule?)
2. Use main branch for anything that is not yet GA'ed?

[pakrym]

Using the main branch is OK while the exporter is in preview.

[reyang]

LGMT given the exporter is still preview.

Let's see if @pakrym would suggest putting this in a feature branch.