feat(zipkin) include http path to span name

[yankun-li-kong]

Add a new parameter span_include_path to decide whether to include http path to span name.
Add test case.

Summary

This PR is based on Kong/kong-plugin-zipkin#124, Thanks @XinweiLiu28
Able to include HTTP path to span name for zipkin plugin

Full changelog

Add a new parameter span_include_path to decide whether to include HTTP path to span name.
Add test case.

Issues resolved

Fix FTI-2842

[mayocream]

I think it is good to have the endpoint in Span name, see OpenTelemetry spec opentelemetry-specification/api.md at main · open-telemetry/opentelemetry-specification

For example, here are potential span names for an endpoint that gets a hypothetical account information:

Span Name	Guidance
get	Too general
get_account/42	Too specific
get_account	Good, and account_id=42 would make a nice Span attribute
get_account/{accountId}	Also good (using the "HTTP route")

[kikito]

This looks ok to me. Could you please include a line on the changelog before merging it?