[WIP] Update to TM v0.26.0 - Part II

[alexanderbez]

This PR is a continuation of #2679. It complete the v0.26 update by finalizing proof and verification updates.

There are issues however:

• A local testnet cannot get past 1 block.
• TestVerifyMultiStoreQueryProof passes locally for me but not on CI.

/cc @jaekwon

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[alexanderbez]

Found the issue with local testnet. v0.26 requires the genesis time to be equal the block time at height 1.

However, our local testnet script/setup generates them per node so there is just a tinyyyy delta. I will update this process.

[alexanderbez]

And looks like TestVerifyMultiStoreQueryProof failing is actually due to a Golang bug: golang/go#27289

[jaekwon]

Bez is working on fixing localnet tests.