Write instrumented bindings

[samlaf]

Is your feature request related to a problem? Please describe.
The avs node spec requires avs node software to instrument all of its json-rpc calls. We implemented this in instrumented_client.go

This is useful but we feel like it might be even more useful to have instrumentation at the function call level. Currently all different contract calls/transactions to eigenlayer core and avs contracts only increase the eth_call metric, so we

Describe the solution you'd like
After we refactor the chainIO clients #26, we could create instrumented_contract_caller/transactor/filterer pretty easily following the same pattern, but these would instrument function calls and export prometheus metrics with call/tx counts + duration of each call to each function. We could then potentially also add those as eigen_ metrics... tbd.

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1. Refactor ChainIO clients structure #26
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