feat(deno/idb): implement IDBObjectStore.get

[hasundue]

• fix(deno/idb): abandon ambient type declaration
• feat(deno/idb): implement IDBObjectStore.get
• refactor(deno/idb): do not replace self.indexedDB

[codecov]

Codecov Report

Attention: Patch coverage is 72.54902% with 28 lines in your changes are missing coverage. Please review.

Project coverage is 84.49%. Comparing base (012f70c) to head (7495403).
Report is 10 commits behind head on main.

Files	Patch %	Lines
deno/idb/mod.ts	58.33%	19 Missing and 1 partial ⚠️
std/stores.ts	53.84%	6 Missing ⚠️
deno/idb/stores.ts	84.61%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #41      +/-   ##
==========================================
- Coverage   86.75%   84.49%   -2.27%     
==========================================
  Files          22       33      +11     
  Lines         725     1090     +365     
  Branches       52       88      +36     
==========================================
+ Hits          629      921     +292     
- Misses         95      166      +71     
- Partials        1        3       +2     

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