keep the original context for GetCommittedState api

[yihuang]

Closes: #376

Currently, the unit test don't pass as expected yet, not sure why, investigating.

Description

A contract that can reproduce the difference in gas consumption between ethermint main and geth:

// SPDX-License-Identifier: GPL-3.0

pragma solidity >=0.7.0 <0.9.0;

/**
 * @title Storage
 * @dev Store & retrieve value in a variable
 */
contract Storage {

    uint256 number;

    /**
     * @dev Store value in variable
     * @param num value to store
     */
    function store(uint256 num) public {
        number = num + 1;
        number = num;
    }

    /**
     * @dev Return value 
     * @return value of 'number'
     */
    function retrieve() public view returns (uint256){
        return number;
    }
}

---

For contributor use:

• Targeted PR against correct branch (see CONTRIBUTING.md)
• Linked to Github issue with discussion and accepted design OR link to spec that describes this work.
• Code follows the module structure standards.
• Wrote unit and integration tests
• Updated relevant documentation (docs/) or specification (x/<module>/spec/)
• Added relevant godoc comments.
• Added a relevant changelog entry to the Unreleased section in CHANGELOG.md
• Re-reviewed Files changed in the Github PR explorer

---

For admin use:

• Added appropriate labels to PR (ex. WIP, R4R, docs, etc)
• Reviewers assigned
• Squashed all commits, uses message "Merge pull request #XYZ: [title]" (coding standards)

[codecov]

Codecov Report

Merging #383 (43bb4f9) into main (f7bcc8d) will increase coverage by 0.04%.
The diff coverage is 89.47%.

@@            Coverage Diff             @@
##             main     #383      +/-   ##
==========================================
+ Coverage   50.49%   50.53%   +0.04%     
==========================================
  Files          48       48              
  Lines        4828     4836       +8     
==========================================
+ Hits         2438     2444       +6     
- Misses       2291     2293       +2     
  Partials       99       99              

Impacted Files	Coverage Δ
x/evm/keeper/keeper.go	69.88% <77.77%> (+0.42%)	⬆️
x/evm/keeper/grpc_query.go	71.11% <100.00%> (-0.10%)	⬇️
x/evm/keeper/state_transition.go	62.16% <100.00%> (-0.34%)	⬇️
x/evm/keeper/statedb.go	84.72% <100.00%> (+0.07%)	⬆️

[leejw51crypto]

lgtm

[fedekunze]

ACK