More OpenTelemetry changes

[majocha]

• Add activity wrapping a test run to easily distinguish traces generated from testhost. Group by assembly + net framework.
• log point-in-time events as events with data instead of activities to declutter traces. (for example StackGuard.Guard)
• Enable trace provider in vsix when build in debug configuration: For example build VisualFSharpDebug in debug mode and start an instance with "Start WIthout Debugging" will produce traces viewable in Jeager.

[github-actions]

❗ Release notes required

@majocha,

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Change path	Release notes path	Description
src/Compiler	docs/release-notes/.FSharp.Compiler.Service/9.0.300.md	No release notes found or release notes format is not correct
vsintegration/src	docs/release-notes/.VisualStudio/17.14.md	No release notes found or release notes format is not correct

[majocha]

Slightly less allocations.

main:

Method	Mean	Error	StdDev	Gen0	Gen1	Gen2	Allocated
ParseAndCheckFileInProject	1.654 s	0.0225 s	0.0199 s	10000.0000	5000.0000	1000.0000	1.96 GB

this PR:

Method	Mean	Error	StdDev	Gen0	Gen1	Gen2	Allocated
ParseAndCheckFileInProject	1.625 s	0.0302 s	0.0297 s	9000.0000	4000.0000	1000.0000	1.91 GB

[psfinaki]

Sorry for nitpicking, but I think from the naming perspective, addEvent and logEvent are synonyms and synonyms are confusing in APIs. Maybe it could be just addEvent and addEventWithTags?

[psfinaki]

As with other OT changes, any Jaeger screenshots would be nice to have :)