[CL][Swap Router]: create swap messages

[p0mvn]

Background

Copy:

• osmosis/x/gamm/keeper/msg_server.go

  Line 185 in 42d73f1

  func (server msgServer) SwapExactAmountOut(goCtx context.Context, msg *types.MsgSwapExactAmountOut) (*types.MsgSwapExactAmountOutResponse, error) {

• osmosis/x/gamm/keeper/msg_server.go

  Line 160 in 42d73f1

  func (server msgServer) SwapExactAmountIn(goCtx context.Context, msg *types.MsgSwapExactAmountIn) (*types.MsgSwapExactAmountInResponse, error) {

Implement respective keeper methods. Do not route yet.

Acceptance Criteria

• message and message server implemented
• tests if applicable
• define and emit new event