Standardize on internal tag/attribute naming as @jaeger@something

[yurishkuro]

Currently we use inconsistent naming for internal attributes

• jaeger.internal.warnings in internal/jptrace/warning.go
• internal.span.format in cmd/collector/app/span_processor.go
• span.hash being introduced in [v2][WIP] Span hash sanitizer and enhance span hash adjuster #6499

I propose we use a shorter but more distinct naming scheme that does not match the normal dot-separated format of OTEL attributes. The above three keys would become

• @jaeger@warnings
• @jaeger@format ("span" is implied since it's on the span)
• @jaeger@hash ("span" is implied since it's on the span)

[ADI-ROXX]

jaeger.internal.warnings in internal/jptrace/warning.go
internal.span.format in cmd/collector/app/span_processor.go

@yurishkuro Apart from the above naming conventions and span.hash, which will be pushed later on, is there any other naming convention that needs to be changed to "@jaeger@something" format?

[yurishkuro]

I don't recall if we have any other internal tags.