feat(plugin-core): new plugin-core package (#1193)

packages/plugin-core/.mocharc.json

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+{
+  "extension": ["ts"],
+  "spec": "test/**/*.test.ts",
+  "require": "ts-node/register"
+}

packages/plugin-core/MIT-LICENSE

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+Copyright (c) 2023 Honeybadger Industries LLC
+
+Permission is hereby granted, free of charge, to any person
+obtaining a copy of this software and associated documentation
+files (the "Software"), to deal in the Software without
+restriction, including without limitation the rights to use,
+copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the
+Software is furnished to do so, subject to the following
+conditions:
+
+The above copyright notice and this permission notice shall be
+included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+OTHER DEALINGS IN THE SOFTWARE.

packages/plugin-core/README.md

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+# Honeybadger JavaScript Build Plugin
+
+Shared library for uploading sourcemaps and sending deploy notifications to Honeybadger. 
+
+## Usage
+
+You shouldn't need to use this package directly. This package serves as the core implementation of shared functionality meant to be used within Honeybadger's plugins for JS build/bundling systems such as [webpack](https://github.com/honeybadger-io/honeybadger-js/tree/master/packages/webpack) and [rollup](https://github.com/honeybadger-io/honeybadger-js/tree/master/packages/rollup-plugin). 
+
+## Development
+
+1. Run `npm install`
+2. Run the tests with `npm test`
+3. Build with `npm run build`
+
+## License
+
+This package is MIT licensed. See the [MIT-LICENSE](./MIT-LICENSE) file in this folder for details.