* Update the semconv constants to v1.5.0
Also, tweak our checkstyle settings to allow long markdown-style links.
* remove linelength checkstyle checks, since spotless already formats for us
* Add javadoc to the package-info.java for Sampling
and update some javadoc for parent-based Samplers.
* Suppress linelength for package-info
* tweak some language, add a link to the spec
* pin the url to a specific SHA
Co-authored-by: Anuraag Agrawal <aanuraag@amazon.co.jp>