tracing: New OpenTelemetry module (#4361)

* opentelemetry: create a new module

* fix imports

* fix test

* Update modules/caddyhttp/opentelemetry/README.md

Co-authored-by: Dave Henderson <dhenderson@gmail.com>

* Update modules/caddyhttp/opentelemetry/README.md

Co-authored-by: Dave Henderson <dhenderson@gmail.com>

* Update modules/caddyhttp/opentelemetry/README.md

Co-authored-by: Dave Henderson <dhenderson@gmail.com>

* Update modules/caddyhttp/opentelemetry/tracer.go

Co-authored-by: Dave Henderson <dhenderson@gmail.com>

* rename error ErrUnsupportedTracesProtocol

* replace spaces with tabs in the test data

* Update modules/caddyhttp/opentelemetry/README.md

Co-authored-by: Francis Lavoie <lavofr@gmail.com>

* Update modules/caddyhttp/opentelemetry/README.md

Co-authored-by: Francis Lavoie <lavofr@gmail.com>

* replace spaces with tabs in the README.md

* use default values for a propagation and exporter protocol

* set http attributes with helper

* simplify code

* Cleanup modules/caddyhttp/opentelemetry/README.md

Co-authored-by: Dave Henderson <dhenderson@gmail.com>

* Update link in README.md

Co-authored-by: Dave Henderson <dhenderson@gmail.com>

* Update documentation in README.md

Co-authored-by: Dave Henderson <dhenderson@gmail.com>

* Update link to naming spec in README.md

Co-authored-by: Dave Henderson <dhenderson@gmail.com>

* Rename module from opentelemetry to tracing

Co-authored-by: Dave Henderson <dhenderson@gmail.com>

* Rename span_name to span

Co-authored-by: Dave Henderson <dhenderson@gmail.com>

* Rename span_name to span

Co-authored-by: Dave Henderson <dhenderson@gmail.com>

* Simplify otel resource creation

Co-authored-by: Dave Henderson <dhenderson@gmail.com>

* handle extra attributes

Co-authored-by: Dave Henderson <dhenderson@gmail.com>

* update go.opentelemetry.io/otel/semconv to 1.7.0

Co-authored-by: Dave Henderson <dhenderson@gmail.com>

* update go.opentelemetry.io/otel version

* remove environment variable handling

* always use tracecontext,baggage as propagators

* extract tracer name into variable

* rename OpenTelemetry to Tracing

* simplify resource creation

* update go.mod

* rename package from opentelemetry to tracing

* cleanup tests

* update Caddyfile example in README.md

* update README.md

* fix test

* fix module name in README.md

* fix module name in README.md

* change names in README.md and tests

* order imports

* remove redundant tests

* Update documentation README.md

Co-authored-by: Dave Henderson <dhenderson@gmail.com>

* Fix grammar

Co-authored-by: Dave Henderson <dhenderson@gmail.com>

* Update comments

Co-authored-by: Dave Henderson <dhenderson@gmail.com>

* Update comments

Co-authored-by: Dave Henderson <dhenderson@gmail.com>

* update go.sum

* update go.sum

* Add otelhttp instrumentation, update OpenTelemetry libraries.

* Use otelhttp instrumentation for instrumenting HTTP requests.

This change uses context.WithValue to inject the next handler into the
request context via a "nextCall" carrier struct, and pass it on to a
standard Go HTTP handler returned by otelhttp.NewHandler. The
underlying handler will extract the next handler from the context,
call it and pass the returned error to the carrier struct.

* use zap.Error() for the error log

* remove README.md

* update dependencies

* clean up the code

* change comment

* move serveHTTP method from separate file

* add syntax to the UnmarshalCaddyfile comment

* go import the file

* admin: Write proper status on invalid requests (#4569) (fix #4561)

* update dependencies

Co-authored-by: Dave Henderson <dhenderson@gmail.com>
Co-authored-by: Francis Lavoie <lavofr@gmail.com>
Co-authored-by: Vibhav Pant <vibhavp@gmail.com>
Co-authored-by: Alok Naushad <alokme123@gmail.com>
Co-authored-by: Cedric Ziel <cedric@cedric-ziel.com>

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