Get rid of KZG constants

[zilm13]

See: https://github.com/Nashatyrev/teku/blob/das/infrastructure/kzg/src/main/java/tech/pegasys/teku/kzg/KZG.java#L26-L32
We could avoid G1 and G2 by changing trusted format to already flatten.
We could use number of columns from config instead of CELLS_PER_EXT_BLOB.
If something remains, we could mix it to designated test.