Add human friendly descriptions when executing commands or running
scripts.

Here is an example:

Without descriptions.

```bash
Executing command on service 'validator-key-generation-cl-validator-keystore'
Command returned with exit code '0' with no output

Verifying whether two values meet a certain condition '=='
Verification succeeded. Value is '0'.

Storing files from service 'validator-key-generation-cl-validator-keystore' at path '/node-0-keystores' to files artifact with name '1-lighthouse-geth-0-63'
Files with artifact name '1-lighthouse-geth-0-63' uploaded with artifact UUID 'd42fe1052c85433580a752bf818a54f1'

Executing command on service 'validator-key-generation-cl-validator-keystore'
Command returned with exit code '0' with no output
```

With descriptions.

```bash
Generating keystores
Command returned with exit code '0' with no output

Verifying whether two values meet a certain condition '=='
Verification succeeded. Value is '0'.

Storing files from service 'validator-key-generation-cl-validator-keystore' at path '/node-0-keystores' to files artifact with name '1-lighthouse-geth-0-63'
Files with artifact name '1-lighthouse-geth-0-63' uploaded with artifact UUID '51cfc3d4fd01469ca5512628098ab87f'

Storing prysm password in a file
Command returned with exit code '0' with no output
```
Co-authored-by: Barnabas Busa <busa.barnabas@gmail.com>