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

[loloicci]

Sorry, using force push to rebase it to v2/develop.

[codecov]

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[brew0722]

LGTM

[whylee259]

LGTM 👍

[shiki-tak]

LGTM