Capi serve utility

[harrysolovay]

EDIT:

@tjjfvi suggested we expose a serve utility instead of a CLI. One could use as follows:

deno run -A -r https://deno.land/x/capi/serve.ts -- deno run -A -r path/to/ts_file.ts

path/to/ts_file.ts

import * as polkadot from "http://localhost:2345/discovery_value/mod.ts";

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PREV:

Probably best to utilize a CLI framework like Cliffy (or perhaps there's a better alternative). Using std flags standalone complicates adding new commands while applying common flags to those commands (such as --help/-h/help/?).

For now, the CLI is used only to trigger codegen. I'd imagine we'll introduce other features in the future. Will be good to have a more easily-extensible foundation.