feat: extra codec support and minor improvements

[SebastianElvis]

Fixes #3

This PR adds support for extra codec formats, thus allows to support chains imposing non-standard codec formats such as Injective and EVMOS. This is done by upgrading the dependency in IBC relayer, which adds support of extra codec in cosmos/relayer#1048

In addition, this PR adds documentations, scripts and example configs to ease the deployment.

[vitsalis]

The additions of this PR mostly involve some helper scripts or configs. Do you think that those have a place in this repository? For example:

• examples/: Do we need all of those different json files?
• The scripts that are added are just wrappers of a single command.

I'm ok though with those being added to the repo as this is a helper repository but just wanted to raise this.

[SebastianElvis]

The additions of this PR mostly involve some helper scripts or configs. Do you think that those have a place in this repository?

I feel it would simplify our work on deploying the Babylon relayer a bit.

The configs are identical from those in our current relayer. This repo might be the best place to hold these configs in case if
we terminate the relayer EC2 instance in the future or accidentally.

The scripts are adapted from the CLI commands I used for running relayers of the demo. It might be useful for testing and demo purposes.

• examples/: Do we need all of those different json files?

Although the json files will eventually be a part of config.yaml, I feel it's still good to add them there since one might want to try command babylon-relayer chains add.

• The scripts that are added are just wrappers of a single command.

Yeah agree. Maybe when we start dockerising the Babylon relayer, we can combine these scripts into a single wrapper script or merge them to the Dockerfile.