eth/gasestimator, internal/ethapi: move gas estimator out of rpc #28600
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The gas estimator when added was a very simple piece of code, so we just dumped it into the RPC APIs. Since then, we've made various tweaks to it, and it feels wrong to have logic code sit inside the RPC which should just convert data and call internal stuff.
This PR moves the gas estimator into it's own package. Code that is unrelated to gas estimation and just prepares the data (e.g. RPC overrides) are still kept in their original location. This should be fine because the gas estimator interface was also simplified a lot to allow running it without a live chain and similar crazy constructs.
Fixes #28570