feat: Add A New Message For Storing A Code and Instantiating A Contract With It

[loloicci]

Description

This adds a new message MsgStoreCodeAndInstantiateContract and its handler. This is for storing a WASM code and instantiate a contract from it in one message (tx).

This is the stargate version of #122

closes: #111

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• 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
  (tests for CLI/REST are not included. The former will be added after adding linkwasmd for stargate, the latter will be added if we need REST.)
• Updated relevant documentation (docs/) or specification (x/<module>/spec/) (There are no docs)
• Added relevant godoc comments.
• Added a relevant changelog entry to the Unreleased section in CHANGELOG.md (It will be generated with script)
• Re-reviewed Files changed in the Github PR explorer
• Review Codecov Report in the comment section below once CI passes

[brew0722]

FYI, In order to running github actions(lbm-sdk/v2), you should push the branch to origin repository instead of personal repository.
In case of our team, we are using PR branch name like loloicci/v2/feat/xxx.

#127 (comment)

[loloicci]

moved to #154. thank you, @brew0722