[Queries] Fix queries blocked by heavy EndBlockers

[Olshansk]

tl;dr Fix CosmosSDK and/or CometBFT so RPC queries aren't blocked by slow EndBlockers.

---

Original thread from slack: https://buildwithgrove.slack.com/archives/C047X1T6ERK/p1754138512577569

---

tl;dr I paired in-person with @adi and we put together a hack in CometBFT that proved out the root cause. Next step is to upstream a version of the changes correctly.

--- Context from Slack ---

Context:

1. Here is a mutex related hack in a fork of CometBFT v0.38 that fixes the issue: https://github.com/pokt-network/cometbft/pull/2/files
2. The correct short-term solution is to productionize (1) behind a flag.
3. The correct long-term solution is use unsync_local_client.go and modify how R/W mutexes are handeled from the CosmoSDK side.
4. Bonus: I learnt a few interesting things at Paradigm Frontiers on how reth accounts for these issues and would propose (and implement if supported) a channel based solution to (3)