Export BasePlugin - Githubissues

Checklist

[x] Tick to sign-off your agreement to the Developer Certificate of Origin (DCO) 1.1
[x] Added tests for code changes or test/build only changes
[x] Updated the change log file (CHANGES.md|CHANGELOG.md) or test/build only changes
[x] Completed the PR template below:

Description

Fixes #407

Approach

Expose BasePlugin on the Cloudant factory method so that it can be imported directly from @cloudant/cloudant.

This means that custom plugin authors do not need to require @cloudant/cloudant/plugins/base.

Schema & API Changes

BasePlugin is now part of the public API, e.g.

const Cloudant = require('@cloudant/cloudant');

// Cloudant.BasePlugin is now exported meaning that
// BasePlugin is part of the public API

class MyPlugin extends Cloudant.BasePlugin {
  ...
}

const cloudant = Cloudant({ ..., plugins: [MyPlugin] });

TypeScript types also updated to reflect this and types for BasePlugin have been added so that plugin authors can more easily implement plugins in TypeScript.

Security and Privacy

No change

Testing

Modified existing test for TypeScript types.

Monitoring and Logging