This allows us to support attributes in YAML like this:
```
meta:
foo: bar
bar:
baz: boz
```
Which will automatically become:
```
"meta": "{\"foo\":\"bar\",\"bar\":{\"baz\":\"boz\"}}"
```
> Note: cosmos-sdk's protobuf code does not support maps (https://github.com/cosmos/cosmos-sdk/issues/15254), or else we would just use a map.
Reviewed-on: https://git.vdb.to/cerc-io/laconic-registry-cli/pulls/38
Co-authored-by: Thomas E Lackey <telackey@bozemanpass.com>
Co-committed-by: Thomas E Lackey <telackey@bozemanpass.com>