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<MetaMask/metamask-module-template#108>

* Assume that all JavaScript and TypeScript files are run in a Node
  context, and allow `process.env` to be accessed and `process.exit()`
  to be called freely.
* Tweak rules for blank lines. Currently we check that blank lines are
  inserted in between:

  * A directive prologue (like `use strict`) and anything else (except
    another directive prologue)
  * A multiline block-like statement (e.g. `if`, `while`, IIFEs, etc.)
    and a multiline expressions (e.g. multiline function calls)
  * A multiline block-like statement (e.g. `if`, `while`, IIFEs, etc.)
    and another multiline block-like statement
  * A multiline expression and a multiline block-like statement
  * A multiline expression and another multiline expression

  The issue is that enforcing line breaks in between multiline function
  or method calls makes organizing big integration tests more difficult.
  At the same time, multiline `if` statements more often than not
  involve some kind of complexity that would be unreadable smooshed up
  against some other code, so this commit also enforces empty line
  breaks around any kind of such statement.

Jest 28 enables use of the `jest.mocked` utility which is copied from
`ts-jest` and which gives you a correctly-typed version of a function
you've mocked via `jest.mock`.

v8 isn't quite reliable when using Node 14 for development (it has too
many false negatives). We can consider changing this back if/when we
switch to Node 16 or later, but for now we will stick to Babel.

Remaining tests:

* Remaining monorepo-workflow-utils tests
* package-utils
* project-utils
* workflow-utils

Also maybe move ReleasePlan and PackageReleasePlan into
release-plan-utils? Or move to something else?

Remaining:

* package-manifest-utils
* project-utils
* release-specification-utils
* semver-utils
* workflow-utils

Also, change the root package version number so it looks like
YYYYMMDD.BUILD_NUMBER.0 instead of YEAR.MONTH.DAY-BUILD_NUMBER.