improve(oo): reuse lookback config when initing ooclient

[daywiss]

Motivation

we are getting timeouts and event query exceeded on blast network, seems lookback adjustments are not helping.

Summary

Theres a hardcoded lookback which we now use a config for if defined.

Details

we are overloading the lookback value originally used for oo proposer

Testing

Check a box to describe how you tested these changes and list the steps for reviewers to test.

• [ ] Ran end-to-end test, running the code as in production
• [ ] New unit tests created
• [ ] Existing tests adequate, no new tests required
• [ ] All existing tests pass
• [ ] Untested

Issue(s)

Fixes #XXXX