feat: precompiled contract poc

[dudong2]

Description

Closes: #XXXX

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[cloudgray]

[Question] Is there any other reason you comment TODO?

If type of val.value is slice of other reference type, it will be shallow copied but in this case, deep copy takes place.

I executed this code in golang playground and checked built-in copy function copies value of reference type variable.

    a := []byte("abcd")
	b := make([]byte, len(a))
	copy(b, a)

	a = []byte("1234")

	fmt.Println(&a[0] == &b[0])
	fmt.Println(a)
	fmt.Println(b)

[dudong2]

I'm not sure if the copy of cValue needs to be a deep copy. I'd go with a deep copy first, and if there are performance issues, i'll need to devise another method.

[cloudgray]

[Suggestion] It is chores but I suggest, we can use copiedCache, clonedCache instaed of cache2. This suggestion can be applied to other changes of this PR

[dudong2]

updated.

[cloudgray]

checked.

[cloudgray]

LGTM, but I had a few questions out of curiosity, so I left some comments

[jasonsong0]

LGTM.

[suggestion]
Since cacheKVStore can only have KVStore as its parent, a deep copy is necessary.
It would be good to check the overhead of deep copying and consider improving this later.

[cloudgray]

LGTM!

[dudong2]

rebased due to Send restriction PoC