Include schema_url in FriendlySpanConverter

[sudol]

Regarding this issue: https://github.com/open-telemetry/opentelemetry-php/issues/1290

I believe this is the expected way to communicate the scheme used to a collector or downstream system attempting to analyze the telemetry, based on the documentation on the OpenTelemetry website.

Closes: https://github.com/open-telemetry/opentelemetry-php/issues/1290

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• :white_check_mark: login: sudol / name: Paul (51cb8b0c676777cc5c9d6868ce5449345f6591be, cc72bbfda6260b9eefe2be49bbacf15174f7cf64)

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Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 74.48%. Comparing base (8a6dd47) to head (cc72bbf).

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