perf: optimize json-diff

[jedluhmann]

Optimizations:

lib/index.js

• lines 21-34: Use JSON.stringify() to bypass diff logic when objects are equal
• line 101: Cache changes calculated in this.diff() for later use in arrayDiff where op is 'equal'
• line 101: Switched the order of arguments when calling this.diff() for consistency (candidate is the original value) and to allow caching (reuse change values calculated here in later fuzzy matching)
• line 110: Break out of loop when exact match (value and position) is found
• lines: 179-187: Use JSON.stringify() to bypass diff logic when arrays are equal

Fixes:

lib/index.js

• lines 173-176: Call sort on array arguments, not scalarized sequences