Remove grpc class options from OTLPExporter. Make Endpoint Uri for all frameworks

[cijothomas]

Option 2 from #1778 (comment)

This PR makes Endpoint as Uri for both framework targets.
It removes from OTLPOptions anything tied to Grpc classes. This means users no longer have the ability to use OTLPExporter with TLS.
If https Endpoint is specified, throws at ctor() saying Https is unsupported.

In 1.1, proper support can be added for TLS without requiring breaking changes.

[codecov]

Codecov Report

Merging #1789 (032e8b0) into main (416a6c1) will increase coverage by 0.68%.
The diff coverage is 70.00%.

@@            Coverage Diff             @@
##             main    #1789      +/-   ##
==========================================
+ Coverage   83.14%   83.83%   +0.68%     
==========================================
  Files         193      187       -6     
  Lines        6005     5952      -53     
==========================================
- Hits         4993     4990       -3     
+ Misses       1012      962      -50     

Impacted Files	Coverage Δ
...nTelemetry.Exporter.Jaeger/Implementation/Batch.cs	84.09% <ø> (+3.65%)	⬆️
....Exporter.Jaeger/JaegerExporterHelperExtensions.cs	15.38% <ø> (ø)
...Telemetry.Exporter.Jaeger/JaegerExporterOptions.cs	100.00% <ø> (ø)
...metryProtocol/OtlpTraceExporterHelperExtensions.cs	92.30% <ø> (ø)
....Exporter.Zipkin/ZipkinExporterHelperExtensions.cs	15.38% <ø> (ø)
...Telemetry.Exporter.Zipkin/ZipkinExporterOptions.cs	100.00% <ø> (ø)
...xporter.OpenTelemetryProtocol/OtlpTraceExporter.cs	46.37% <37.93%> (-11.08%)	⬇️
...rc/OpenTelemetry.Exporter.Jaeger/JaegerExporter.cs	85.00% <84.21%> (-0.27%)	⬇️
...orter.OpenTelemetryProtocol/OtlpExporterOptions.cs	100.00% <100.00%> (ø)
...rc/OpenTelemetry.Exporter.Zipkin/ZipkinExporter.cs	87.64% <100.00%> (+0.14%)	⬆️
... and 10 more

[CodeBlanch]

LGTM