Update EL specs to include EIP-7702 type 4 transaction

[SiddharthV1]

What content is missing?

The Prague upgrade introduces a new transaction type: SetCodeTransaction, a part of Ethereum's account abstraction roadmap. This will enable EOAs to set code for their accounts. This should be covered in the EL-specs page.

Related content in the wiki

https://epf.wiki/#/wiki/EL/el-specs

Other relevant resources

Account Abstraction
Vitalik on AA roadmap
EIP 7702
pyspecs