Use canonical name for aiohttp request span name (#3896)

* Use canonical name for aiohttp request span name

* semconv for http server span names

* Update CHANGELOG.md

Co-authored-by: Tammy Baylis <96076570+tammy-baylis-swi@users.noreply.github.com>

* try..except

* pass exception

* {method} only if 404

* Update instrumentation/opentelemetry-instrumentation-aiohttp-server/src/opentelemetry/instrumentation/aiohttp_server/__init__.py

Co-authored-by: Tammy Baylis <96076570+tammy-baylis-swi@users.noreply.github.com>

* Update CHANGELOG.md

* Update __init__.py

* Update CHANGELOG.md

---------

Co-authored-by: Tammy Baylis <96076570+tammy-baylis-swi@users.noreply.github.com>
Co-authored-by: Riccardo Magliocchetti <riccardo.magliocchetti@gmail.com>