Add getAllRecords() method and update getAll()/getAllKeys() to support direction option (#461) (#206)

Closes #206 #130

WPT coverage:

getAllRecords():

//IndexedDB/idbobjectstore_getAllRecords.tentative.any.js
//IndexedDB/idbindex_getAllRecords.tentative.any.js

getAll()/getAllKey() direction option:

//IndexedDB/idbobjectstore_getAllKeys-options.tentative.any.js
//IndexedDB/idbindex_getAllKeys-options.tentative.any.js
//IndexedDB/idbobjectstore_getAll-options.tentative.any.js
//IndexedDB/idbindex_getAll-options.tentative.any.js

Implementation commitment:

 WebKit (TBD)
 Chromium (https://issues.chromium.org/issues/40746016)
 Gecko (TBD)

Outline of change:

Potentially valid key range

Added to support overloading getAll()/getAllKeys() with IDBGetAllOptions as the first argument. Preserves existing behavior for key ranges and keys. Avoids parsing the first argument for getAll()/getAllKeys() as a IDBGetAllOptions when the argument is a key range or has a type that could be a valid key (Number, String, Date, ArrayBuffer, or Array).

Record snapshot

Added for the output of getAllRecords(), which includes the record's key, value and primaryKey. For IDBIndex, key is the index key and primaryKey is the record's key. Required because object stores and indexes define different types of records.

getAll()/getAllKeys()

Methods updated to support overload of the first argument, which is either a key range or an IDBGetAllOptions. IDBGetAllOptions adds direction support.

getAllRecords()

New method added to both IDBObjectStore and IDBIndex. Supports IDBGetAllOptions only.

Retrieve multiple items from an object store/index

Algorithm updated to include more inputs: kind and direction. Kind determines the type of output, which is either keys, values or record snapshots. Direction determines the sorting of the output, which is either ascending or descending.

Author: SteveBeckerMSFT