[#5] Create first draft of Tui with sample process

[TejasSC]

Resolves #5

[chshersh]

@TejasSC Could you attach some screenshots in the comments to this PR?

[TejasSC]

[chshersh]

Looks great! For now the goal is to have some edit boxes inside terminal so we can construct message (even if it's just our hardcoded SearchRequest message). Basically, hardcode graphical view for SearchRequest and give ability to change values of the fields and show serialized message.

[TejasSC]

[TejasSC]

So now it only works if I type in "SearchRequest" and "query" explicitly as Message name and Field name.

How can I make the serialised representation work so that it doesn't fail on different inputs?

[TejasSC]

So now whenever I try to edit protobuf2.proto in the Tui.hs file, it never really works due to the following error.
Hence, I still can't generate custom messages now.

I have now added a way for it to recognise the type of value in a field.