feat: Includes motoko-dev-server in new motoko projects

[krpeacock]

Description

The Motoko project now includes a few new quality-of-life enhancements:

• npm start now starts the motoko-dev-server in addition to the webpack server.
  • This means that you can now use the motoko-dev-server to hot-reload your motoko canisters and frontends as you make changes.
• mops package manager is now included and configured
  • This installs the motoko-base and test libraries
• hello world now includes a lib.mo and lib.test.mo file
  • This demonstrates write tests for your canisters and run them with npm run test:motoko

Fixes #SDK-991

How Has This Been Tested?

Manually compiling the rust and motoko new projects

• dfx deploy
  • visiting the webpage
• npm start
  • visiting the webpage

Checklist:

• The title of this PR complies with Conventional Commits.
• I have edited the CHANGELOG accordingly.
• I have made corresponding changes to the documentation.

[krpeacock]

Noting here - mops sources failed during CI with exit status: 254. It may be that mops isn't mature enough yet

[rvanasa]

Which version of Node.js is being used in the CI?

(Update: it's Node 18.x)

[rvanasa]

@krpeacock @ZenVoich @dfx-json, these CI errors are apparently caused by the replica timing out rather than an issue with Mops (relevant log output).

I temporarily switched the default mops.toml dependencies to use GitHub repositories to unblock progress on renovating the dfx new command.