fix: small fix and refactor after testing EkuboV2 (#188)

* fix: add `balance_owner` attribute for ekubo_v2 components

* refactor: rename `ekubo` into `ekubo-v2`

* refactor: freeze `substreams-helper` version in ekubo V2 module

* docs: improve integration test comment

* docs: add TODO to remove `balance_owner` in favor of `AccountBalances`

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Co-authored-by: zizou <111426680+flopell@users.noreply.github.com>

substreams/ethereum-ekubo-v2/src/abi/mod.rs

@@ -0,0 +1,2 @@
+#![allow(clippy::all)]
+pub mod core;