Update EIP-4844: Increase Blob Throughput

[adietrichs]

Increases the throughput to a target of 3 blobs (0.375MB) and limit of 6 blobs (0.75MB) as decided on ethereum/pm#786.

Also adjusts DATA_GASPRICE_UPDATE_FRACTION to keep targeting a max change rate for the blob gas price of 12.5% per block (see EIP section for math).

[eth-bot]

✅ All reviewers have approved.

[ralexstokes]

looks good, I think we should move ahead w/ this change on 4844 devnets and can always dial it back down if needed

[ralexstokes]

checking math:
2^18 works out to 2 blobs (4096 * 32 bytes per blob given trusted setup size)
2^19 works out to 4 blobs (max is double target)

if we increase target by 50% (to move from 2 to 3), then we in fact get the numbers proposed

[dankrad]

consider 3 * 2**18 and 3 * 2**17 for legibility?

[ralexstokes]

could add in the third column (so after the decimal representations), I do like having the multiplier * base factor representation

[adietrichs]

the problem is that this depends on the specific context, e.g. not obvious why it always should be base 2. or also, might be better in this specific case to always use factor * 2**17 (so that factor would be the number of blobs)

[flcl42]

If you go with partially calculated values, here another option (clearer imho):
3 * DATA_GAS_PER_BLOB
6 * DATA_GAS_PER_BLOB

[eth-bot]

All Reviewers Have Approved; Performing Automatic Merge...