* chore(simple_client): Add explicit ServiceUnavailable error type

* chore(simple_client): Add explicit ServiceUnavailable error type - bring back constructor

* chore(simple_client): Add explicit ServiceUnavailable error type - fix lint

* chore: update op dependency to v1.10.0

* chore: downgrade to v1.9.5 + fix optimism tests

* docs: update README with failover info

* docs(README): add link to arb failover spec

* docs(README): add "Service Unavailable" description for 503 status code

* fix: Disable svc manager address & eth rpc as mandatory

* fix: Disable svc manager address & eth rpc as mandatory - add eigenda client override when memstore enabled

* chore(simple_client): Add explicit ServiceUnavailable error type - address PR comment and add unit test

* chore(simple_client): Add explicit ServiceUnavailable error type - address PR comment

* feat: separate simple client into its own module

This will make it easier to import it into other projects without importing all of the other dependencies of our root go.mod.
We will first merge this PR with a replace directive in the main go.mod, then release v0.1.0 of the new client module, and then
make a new PR to use that version in the main go.mod file.

* chore: SimpleClient -> Standard Client (#210)

---------

Co-authored-by: Ethen <ethen@eigenlabs.org>

fix: copy client/go.mod to builder