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An indirect dependency of Commitizen (`merge`) is currently failing the
NPM.js auditor due to vulnerability CVE-2020-28499. This commit moves
the minimum version of Commitizen to 4.2.4, which has resolved this
vulnerability.

Change-Id: Ia9455bdbe02f7406c1a106f173c4095943a201ed
Signed-off-by: Chris Kay <chris.kay@arm.com>

This change adds a configuration for commitlint - a tool designed to
enforce a particular commit message style - and run it as part of Git's
commit-msg hook. This validates commits immediately after the editor has
been exited, and the configuration is derived from the configuration we
provide to Commitizen.

While the configuration provided suggests a maximum header and body
length, neither of these are hard errors. This is to accommodate the
occasional commit where it may be difficult or impossible to comply
with the length requirements (for example, with a particularly long
scope, or a long URL in the message body).

Change-Id: Ib5e90472fd1f1da9c2bff47703c9682232ee5679
Signed-off-by: Chris Kay <chris.kay@arm.com>

This change adds Commitizen, an interactive tool for writing commit
messages, to the package.json file. This installs Commitizen within the
`node_modules` directory automatically when developers invoke
`npm install` from the root repository directory.

Additionally, this change adds a prepare-commit-msg Git hook which
invokes Commitizen prior to generation of the default commit message.
It may be exited with the standard ^C signal without terminating the
commit process for those who desperately want to avoid using it, but
otherwise should encourage developers to conform to the new commit style
without running into post-commit linting errors.

Change-Id: I8a1e268ed40b61af38519d13d62b116fce76a494
Signed-off-by: Chris Kay <chris.kay@arm.com>

Husky is a tool for managing Git hooks within the repository itself.
Traditionally, commit hooks need to be manually installed on a per-user
basis, but Husky allows us to install these hooks either automatically
when `npm install` is invoked within the repository, or manually with
`npx husky install`.

This will become useful for us in the next few patches when we begin
introducing tools for enforcing a commit message style.

Change-Id: I64cae147e9ea910347416cfe0bcc4652ec9b4830
Signed-off-by: Chris Kay <chris.kay@arm.com>