feat: add biocfilecache-backed persistent caching

[mtran-code]

what changed

• add a package-level BiocFileCache layer with deterministic cache keys
• persist remote metadata for Cellosaurus, PubChem, ChEMBL, UniChem, OncoTree, and BioMart
• cache parsed API query results for Cellosaurus, PubChem, ChEMBL, UniChem, and HGNC BioMart where raw and query_only are not requested
• isolate test runs in a temporary AnnotationGx cache directory and add cache helper coverage
• bump the package version to 0.99.7 and record the change in NEWS.md

why it changed

• the package makes repeated remote requests against APIs that are slow, rate-limited, or transiently unavailable
• persistent caching reduces redundant traffic, improves repeat-call latency, and gives the package a legitimate Bioconductor infrastructure dependency

impact

• repeated metadata lookups and parsed query calls now reuse cached results across R sessions by default
• low-level raw and query_only workflows still bypass the persistent cache
• tests no longer touch a user cache directory during package checks

validation

• parsed NEWS.md with tools:::.build_news_db_from_package_NEWS_md()
• ran the full tests/testthat suite file-by-file under load_all() with an isolated temp cache

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• Create PR with unit tests
• Commit unit tests in branch feat/add-BiocFileCache

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