Addressable 8kb

[Scooletz]

This PR reintroduces the ability for the SlottedArray to address 8kb. Also, removes the masking of the hash which could make the Prepare / Unprepare a bit faster. This is an enabler for #375 to make pages bigger and allow to amortize more.

To make it work, this PR splits the cases of keys:

1. 0-length - encoded as 0b00 in preamble
2. 1,2,3 - nibbles - length encoded as one nibble in the hash, marker set in preamble 0b01
3. 4 nibbles - 0b10 in preamble to represent 4
4. 5+ nibbles - 0b11 in preamble to represent 5+ as some key parts will be in the array

As the values above take 2 bits, 1 bit is used to mark Odd/Deleted. This leaves 13 out of 16 to address 8k

Benchmarks

Before

Method	sliceFrom	length	Mean	Error	StdDev	Code Size
EnumerateAll	?	?	761.759 ns	10.7755 ns	10.0795 ns	2,145 B
Prepare_Key	0	0	2.507 ns	0.0601 ns	0.0562 ns	763 B
Prepare_Key	0	1	2.342 ns	0.0365 ns	0.0324 ns	727 B
Prepare_Key	0	2	2.224 ns	0.0492 ns	0.0460 ns	727 B
Prepare_Key	0	3	2.371 ns	0.0299 ns	0.0280 ns	726 B
Prepare_Key	0	4	2.242 ns	0.0341 ns	0.0302 ns	725 B
Prepare_Key	0	6	3.768 ns	0.0337 ns	0.0281 ns	763 B
Prepare_Key	0	32	3.834 ns	0.0460 ns	0.0430 ns	763 B
Prepare_Key	1	1	2.249 ns	0.0296 ns	0.0277 ns	727 B
Prepare_Key	1	2	2.551 ns	0.0419 ns	0.0371 ns	726 B
Prepare_Key	1	3	2.413 ns	0.0492 ns	0.0411 ns	725 B
Prepare_Key	1	4	2.323 ns	0.0336 ns	0.0314 ns	726 B
Prepare_Key	1	6	3.466 ns	0.0400 ns	0.0374 ns	723 B
Prepare_Key	1	30	3.502 ns	0.0447 ns	0.0374 ns	723 B
Prepare_Key	1	31	3.547 ns	0.0619 ns	0.0579 ns	723 B

After

Method	sliceFrom	length	Mean	Error	StdDev	Code Size
EnumerateAll	?	?	777.297 ns	10.9494 ns	9.7063 ns	1,913 B
Prepare_Key	0	0	2.087 ns	0.0282 ns	0.0263 ns	718 B
Prepare_Key	0	1	1.683 ns	0.0366 ns	0.0343 ns	715 B
Prepare_Key	0	2	1.627 ns	0.0365 ns	0.0341 ns	715 B
Prepare_Key	0	3	1.707 ns	0.0326 ns	0.0305 ns	715 B
Prepare_Key	0	4	1.688 ns	0.0244 ns	0.0228 ns	715 B
Prepare_Key	0	6	3.314 ns	0.0316 ns	0.0296 ns	742 B
Prepare_Key	0	32	3.351 ns	0.0350 ns	0.0327 ns	742 B
Prepare_Key	1	1	1.691 ns	0.0365 ns	0.0341 ns	715 B
Prepare_Key	1	2	1.739 ns	0.0392 ns	0.0366 ns	712 B
Prepare_Key	1	3	1.689 ns	0.0347 ns	0.0324 ns	715 B
Prepare_Key	1	4	1.898 ns	0.0357 ns	0.0334 ns	719 B
Prepare_Key	1	6	2.995 ns	0.0436 ns	0.0408 ns	694 B
Prepare_Key	1	30	3.003 ns	0.0508 ns	0.0451 ns	694 B
Prepare_Key	1	31	3.077 ns	0.0251 ns	0.0235 ns	694 B

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