Rename eth module files to match convention

- Agreed upon convention for a module is `module/base_module.py`, `module/module.py`, and `module/async_module.py`

Author: fselmo

newsfragments/2772.internal.rst

@@ -0,0 +1 @@
+Rename the newly-split ``eth`` module files to match convention.

web3/eth/__init__.py

@@ -1,10 +1,10 @@
 from .async_eth import (  # noqa: F401
     AsyncEth,
 )
-from .base import (  # noqa: F401
+from .base_eth import (  # noqa: F401
     BaseEth,
 )
-from .main import (  # noqa: F401
+from .eth import (  # noqa: F401
     Eth,
     Contract,
 )

web3/eth/async_eth.py

@@ -37,7 +37,7 @@
     AsyncContract,
     AsyncContractCaller,
 )
-from web3.eth.base import (
+from web3.eth.base_eth import (
     BaseEth,
 )
 from web3.exceptions import (

web3/eth/base.py renamed to web3/eth/base_eth.py

@@ -53,7 +53,7 @@
     Contract,
     ContractCaller,
 )
-from web3.eth.base import (
+from web3.eth.base_eth import (
     BaseEth,
 )
 from web3.exceptions import (