fix(NODE-4621): ipv6 address handling in HostAddress

[nbbeeken]

Description

NODE-4621

What is changing?

Always include brackets when getting the whole hostAddress string.

• Ensure Connection instances have the correct formatted address for ipv6
• HostAddress.toString no longer accepts a flag for disabling IPv6 brackets (they should never have been created without brackets)
• Wrap the error thrown from new URL it was very unclear only printing: TypeError: Invalid URL prints the input hostname now and attaches the original error as a cause.
• Fixed up a cursor test while debugging it, I can revert, it just happened to demonstrate an issue with bracketing
• fixed type of this.configuration.options.hostAddresses to not be nullish
• Added the --ipv6 flag to our mtools script
• cmap spec runner improvement, print the original error stack and name, otherwise its hard to trace
• fixed uri_spec_runner to handle new error wrapping logic, I can remove the TypeError handling now, thoughts?
• Added unit tests to connection_string to demonstrate what does and does not work with IPv6 addresses
• Notably: Added IPv6 integration tests that only run on Windows and ReplicaSet configs.
  • This is because Ubuntu 18.04 (our current default OS) does not have a hostname lookup for localhost to ::1 by default, Windows, does, and on macos we don't run replica_sets

What is the motivation for this change?

When a port exists (which always does for us) you must include brackets for the whole host address

Double check the following

• Ran npm run check:lint script
• Self-review completed using the steps outlined here
• PR title follows the correct format: <type>(NODE-xxxx)<!>: <description>
• Changes are covered by tests
• New TODOs have a related JIRA ticket