feat(ensembl): support versioned Ensembl IDs

[davereinhart]

Description

Accept an optional version suffix (e.g. ENSG00000012048.15) in the Ensembl regexp, matching the version handling already used by the uniprot and refseq patterns. The version is preserved by normalization (as with refseq) and stripped only when generating a landing-page URL.

Add a test case covering detection, normalization and URL generation for a versioned ID.

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[tmorrell]

Thanks for this contribution! This looks like a sensible improvement. I'll leave the PR open for a bit in case others have opinions.