Populate OTel Schema URL on Activity Sources and Meters

[lmolkova]

Is there an existing issue for this?

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Is your feature request related to a problem? Please describe the problem.

OTel telemetry should have schema source and version associated with it. It helps to validate, transform, evolve, and query telemetry data. See dotnet/runtime#63651 (comment) for the context

Describe the solution you'd like

SchemaURL support is being introduced in .NET 10 - dotnet/runtime#113034, we should set it on ActivitySources and Meters created by ASP.NET Core, SignalR, RateLimiting, etc (see all sources and meters, probably also this meter)

Additional context

No response