Implement realm client generation

[deelawn]

The goal is to write a code generation CLI tool that does the following:

• retrieve function definitions of a deployed contract
• generate a CLI tool with each supported contract function being a separate subcommand
• continue to support other maketx CLI flags but include reasonable default values so they must not be specified each time

[clockworkgr]

The tool should also use templating to generate a ts file of this format:

https://github.com/gnolang/gno-js-client/blob/feat/extensible-client/src/realm-module-example/realm-module.ts

for the various realm method calls in order to support code-completion & type-safety for realms as plugins to gno-js client as enabled in this PR: gnolang/gno-js-client#57

[deelawn]

stale