feat: adds getter function to provider class for retrieving total executed batches

[dutterbutter]

• Still unsure if this is needed, as its being tested to resolve Intermittent Finalization Failure matter-labs/dapp-portal#193 based on fix: add retry and check using new sdk method for finalization matter-labs/dapp-portal#194

What 💻

• First thing updated with this PR
• Second thing updated with this PR
• Third thing updated with this PR

Why ✋

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Notes 📝

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[petarTxFusion]

Hey Dustin, we can keep it like this and if you can just give us the heads up before it can be merged so that we can prepare other SDKs

[dutterbutter]

Thanks @petarTxFusion ! Still unsure if this change is useful or not. I have the ethers v6 version here fyi.

[petarTxFusion]

Then we should wait and discuss it since it could be troubling if we endup needing to remove it and result in breaking change. The code looks fine only tests are missing but we can add that if we decide to merge it