✨ BytesStorage uint8At

[Vectorized]

Description

Very efficient.

Checklist

Ensure you completed all of the steps below before submitting your pull request:

• Ran forge fmt?
• Ran forge test?

Pull requests with an incomplete checklist will be thrown out.

[github-actions]

Gas Snapshot Comparison Report

Generated at commit : 14a63f4, Compared to commit : dcdfab8

Contract Name	Test Name	Main Gas	PR Gas	Diff
LibStringTest	testBytesToHexStringNoPrefix()	4466	4488	22
	testContains()	44604	44626	22
	testSetAndGetStringStorage()	2339009	2358635	19626
	testStringDirectReturn()	6697	6961	264
	testStringEscapeJSONHexEncode()	698533	718640	20107
	testStringIs7BitASCII()	205368	205346	-22
	testStringLastIndexOf()	24847	24869	22
	testStringPackAndUnpackOne()	723040	745232	22192
	testStringPackAndUnpackTwo()	4243725	903523	-3340202
	testStringRepeatOriginal()	9683	9705	22
	testStringReplaceLong()	8162	8184	22
	testStringReplaceMedium()	7423	7357	-66
	testStringReplaceShort()	12253	12275	22
	testStringSplit()	20583	20518	-65
	testStringStartsWith()	3495	3473	-22
	testToHexStringUint256Max()	3420	3442	22
	testToMinimalHexStringNoPrefixZero()	808	830	22
	testToMinimalHexStringZero()	851	873	22
	testToStringPositiveNumberBrutalized()	574441	593695	19254
	testToStringSignedOriginalGas()	9921	9876	-45
	testToStringUint256Max()	6666	6644	-22
	testToStringUint256MaxBrutalized()	585652	605231	19579
	testToStringZeroBrutalized()	573701	593492	19791
	test__codesize()	50361	51311	950
	testUint8AtStringStorage()	-	67050	-