fix!: remove grpc query routing through tendermint (backport cosmos#1…

…0045) (cosmos#10269)

* fix!: remove grpc query routing through tendermint (cosmos#10045)

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Revert routing queries through tendermint.

The reason this change was made is because of this error:
```
fatal error: concurrent map read and map write
```

The person who identified this error submitted these steps to reproduce
```
User sends a query with grpc
Tendermint Commit new blocks and tries to Commit IAVL (which causing IAVL versions map to change)
At the same time query tries to read from the same map (iavl.(*MutableTree).VersionExists) to check if requested version is exists
Node exits with fatal error: concurrent map read and map write
```

With the recent changes to IAVL submitted by terra (cc @YunSuk-Yeo) the reason for why we need to route through tendermint is no longer present. We should revert it when 0.17.1 of IAVL is cut, which will be later today.

---

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- [ ] added `!` to the type prefix if API or client breaking change
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I have...

- [ ] confirmed the correct [type prefix](https://github.com/commitizen/conventional-commit-types/blob/v3.0.0/index.json) in the PR title
- [ ] confirmed `!` in the type prefix if API or client breaking change
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- [ ] manually tested (if applicable)

(cherry picked from commit 8091846)

* fix conflicts

* revert

Co-authored-by: Marko <marbar3778@yahoo.com>

CHANGELOG.md

@@ -41,6 +41,10 @@ Ref: https://keepachangelog.com/en/1.0.0/
 
 * (client) [#10226](https://github.com/cosmos/cosmos-sdk/pull/10226) Fix --home flag parsing. 
 
+### Improvements
+
+* [\#10045](https://github.com/cosmos/cosmos-sdk/pull/10045) Revert [#8549](https://github.com/cosmos/cosmos-sdk/pull/8549). Do not route grpc queries through Tendermint.
+
 ## [v0.44.1](https://github.com/cosmos/cosmos-sdk/releases/tag/v0.44.1) - 2021-09-29
 
 ### Improvements