Change EVM assembly extension to `.eas`

Consistent with geas convention

diff --git a/create2-deployment.evm b/create2-deployment.eas
similarity index 100%
rename from create2-deployment.evm
rename to create2-deployment.eas

diff --git a/create2.evm b/create2.eas
similarity index 100%
rename from create2.evm
rename to create2.eas

diff --git a/minimal-contract-deployment.evm b/minimal-contract-deployment.eas
similarity index 100%
rename from minimal-contract-deployment.evm
rename to minimal-contract-deployment.eas