Add Analytics support

[creativecreatorormaybenot]

Description

This PR achieves the following, centered about adding analytics support to the plugin:

• Integrates Issue 60 fix algolia query snapshot #61 (single bug fix).
• Integrates Added queryID to QuerySnapshot #50, which adds the queryID to the query snapshot.
• Integrates Adds insights implementation #56, which adds Insights API support.
• Cleans up the CHANGELOG to align with idioms used in Dart packages (see official Flutter packages e.g.)
• Cleans up the test file to use idiomatic test descriptions and groups.

[creativecreatorormaybenot]

Closing because this was (without notice and without acknowledgement) integrated into master in 9e60161.