transaction memo is not supported by cosmosclient

[fmorency]

Is your feature request related to a problem or issue you encountered? Please describe.
One is not able to set a transaction memo when using the cosmosclient package.

Describe the solution you'd like
The ability to set a transaction memo when using the cosmosclient package.

Add transaction memo support to the BankSendTx helper function as well.

Backport the fix to previous Ignite versions.

Describe alternatives you've considered
Not use cosmosclient and fallback to CosmosSDK.

[fmorency]

I believe one should set the Memo in the txBuilder, e.g., txBuilder.SetMemo("my memo")