Add brackets (`[]{}`) to defaultKeyMap for keyboard()/type()

[bawjensen]

What:

Adding support for brackets to address #1225

Why:

To allow easier testing of functionality that relies on both key and code being valid for keyboard events involving left/right brackets

How:

Updated keyMap.ts, ran the test suite.

Checklist:

• [N/A] Documentation
• [x] Tests
• [x] Ready to be merged

I'm unclear whether any documentation needs updating, since I imagine this just falls under the heading of the TODO at the bottom of keyMap.ts, i.e. this is simply filling out the mappings.

Also I considered the updates to the existing tests enough, but it's possibly I ought to add more test cases (namely for the right bracket cases).

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:tada: This PR is included in version 14.6.1 :tada:

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