(example) Patch some crates that we have forked at the workspace level for namada v0.7.1

[james-chf]

Resolves #527

This PR changes tendermint-rs, ibc-rs and tower-abci forks that we depend on to be patched in the workspace Cargo.toml, rather than pulled in directly via git in individual crate Cargo.tomls. Feature flags we are using stay specified in individual crate Cargo.tomls. We are already following this sort of pattern for our borsh fork.

Also in tandem with this PR, our ibc-rs and tower-abci forks should be updated to do something similar.

ibc-rs - heliaxdev/ibc-rs#3
tower-abci - heliaxdev/tower-abci#2

Specifically, they shouldn't depend on our tendermint-rs fork directly via git but should instead use a [patch.crates-io] entry. This means when we patch tendermint-rs in namada, e.g. changing the rev to something different, the patch will propagate to ibc-rs and tower-abci without us having to go and update the hardcoded rev in those forks as well.

[james-chf]

pls update wasm

[james-chf]

This PR just served as a proof of concept and shouldn't actually land since in main, since we are using an old Tendermint v0.36-based fork there and are upgrading to Tendermint v0.37 in the eth-bridge-integration branch. Instead we should land #531 and then update main to use Tendermint v0.37 all at once by merging in the needed changes from eth-bridge-integration.