Shortcut when two json documents are same

[nak3]

When two json documents are same, patch is not created.
However, current code tries to check the diff and takes some time and memory.
Hence this patch adds bytes.Equal before creating patch to skip it.

Also, the current bench mark largeArray is using a same value
so update it to use different values in array.

Here is the bench mark before(13a9e4a) and after (d5e5602).

• large_array becomes much faster.
• reflect.DeepEqual does not make much performance degradation as per complex and simple tests.

goos: linux
goarch: amd64
pkg: gomodules.xyz/jsonpatch/v2
cpu: Intel(R) Core(TM) i7-10610U CPU @ 1.80GHz
                          │     before      │                after                 │
                          │     sec/op      │    sec/op     vs base                │
CreatePatch/complex-8          152.5µ ± 22%   150.4µ ±  4%        ~ (p=0.796 n=10)
CreatePatch/large_array-8   1479.550µ ± 26%   8.061µ ± 28%  -99.46% (p=0.000 n=10)
CreatePatch/simple-8           19.30µ ± 25%   14.77µ ± 10%  -23.46% (p=0.023 n=10)
geomean                        163.3µ         26.16µ        -83.98%

                          │    before     │                after                 │
                          │     B/op      │     B/op      vs base                │
CreatePatch/complex-8        83.80Ki ± 0%   83.83Ki ± 0%   +0.04% (p=0.013 n=10)
CreatePatch/large_array-8   945.37Ki ± 0%   36.05Ki ± 0%  -96.19% (p=0.000 n=10)
CreatePatch/simple-8         2.289Ki ± 9%   2.539Ki ± 8%  +10.92% (p=0.005 n=10)
geomean                      56.60Ki        19.72Ki       -65.15%

                          │     before     │                after                │
                          │   allocs/op    │  allocs/op   vs base                │
CreatePatch/complex-8          1.180k ± 0%   1.182k ± 0%   +0.17% (p=0.001 n=10)
CreatePatch/large_array-8   14785.000 ± 0%    4.000 ± 0%  -99.97% (p=0.000 n=10)
CreatePatch/simple-8            33.00 ± 6%    37.00 ± 5%  +12.12% (p=0.001 n=10)
geomean                         831.9         55.93       -93.28%

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[nak3]

/cc @tamalsaha @howardjohn

Could you please take a look?

[tamalsaha]

https://github.com/gomodules/jsonpatch/releases/tag/v2.4.0

Thanks for the contribution @nak3 !