fix: represent authorization list r/s as uint256 per EIP-7702

[kushdab]

Fixes #3716.

Problem

EIP-7702 specifies r and s in authorization tuples as uint256 (integers), not bytes32. The current formatter converts them to HexBytes(32), which is incorrect for both the formatter and the SetCodeAuthorizationData TypedDict.

Changes

web3/_utils/method_formatters.py

# Before
"r": to_hexbytes(32, variable_length=True),
"s": to_hexbytes(32, variable_length=True),

# After
"r": to_integer_if_hex,
"s": to_integer_if_hex,

web3/types.py

# Before
r: HexBytes
s: HexBytes

# After
r: int
s: int

web3/_utils/module_testing/eth_module.py

# Before
assert isinstance(get_auth["r"], HexBytes)
assert isinstance(get_auth["s"], HexBytes)

# After
assert isinstance(get_auth["r"], int)
assert isinstance(get_auth["s"], int)

(Same change in both sync and async test methods.)

Testing

The existing EIP-7702 integration tests in eth_module.py are updated to assert int rather than HexBytes. The formatter change is covered by the existing test fixtures.