refactor(snippets): moving the library over to be an HTTPSnippet plugin

[erunion]

🧰 Changes

With the work I did in https://github.com/readmeio/httpsnippet/releases/tag/8.1.0 this slightly refactors¹ httpsnippet-client-api to now be a proper new HTTPSnippet plugin so it can now be installed as a one-liner:

import { HTTPSnippet, addClientPlugin } from '@readme/httpsnippet';
import plugin from 'httpsnippet-client-api';

addClientPlugin(plugin);

Previously the way it was installed was as such:

import { HTTPSnippet, addTargetClient } from '@readme/httpsnippet';
import plugin from 'httpsnippet-client-api';

addTargetClient('node', plugin);

This plugin refactor allows us to move the target that we're targeting, node, directly onto the client plugin. This refactor, and the addition of an installation message on the client will allow us to do some fun stuff in @readme/oas-to-snippet and accept plugins from outside sources.

Footnotes

1. Very much a breaking change refactor but because we're still in beta land with this work I'm not going to bother versioning this to another major. ↩

[kanadgupta]

i'm having a little trouble wrapping my head around how all these changes fit together lol but on the whole excited for this!