ci: added build sdk step

[Fraccaman]

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[yito88]

@Fraccaman Thank you!
I tried it on v0.26.0. Building namada-sdk requires features async-trait and tendermint-rpc (and rand in Cargo.toml of sdk).

	$(cargo) build --package namada_sdk --features tendermint-rpc

Or, should we add async-trait and tendermint-rpc to features' deafult in sdk?

P.S. tendermint-rpc includes async-trait.
I think we should be able to build SDK without any additional features. I've fixed in #2165.

[Fraccaman]

@yito88 sounds great!

[tzemanovic]

I think we don't need a new ci step for this - just need to add it to make check-crates (see #2061)