feat: add market making order type

[hallazzang]

Description

This PR adds a new type of order, market making order.

Tasks

• [x] Add MsgMMOrder msg
  • [x] Write validation function and tests
• [x] Add MaxNumMarketMakingOrderTicks param
  • [x] Write tests
• [x] Write simulation test
• [x] Delete MMOrderIndex when there's no MMOrder anymore
• [x] Write unit tests (MMOrderTicks, deleted MMOrderIndex)
• [x] Update relevant docs
• [x] Migration code ( order type )

References

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• [ ] Appropriate labels applied
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• [ ] 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
• [ ] Updated relevant documentation (docs/) or specification (x/<module>/spec/)
• [ ] Added relevant godoc comments.
• [ ] Re-reviewed Files changed in the Github PR explorer
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[dongsam]

@hallazzang Could I rebase upstream and squash the commits and force-push for easy sync?

[hallazzang]

@dongsam Sure!