feat(cli): add environment variable support for CLI commands

[DmitryAnansky]

What/Why/How?

Added environment variable support for CLI arguments using Yargs env() method to parse environment variables with matching prefixes.
Suggested prefix format is REDOCLY_CLI_{COMMAND_NAME}.

Alternative

We can have single REDOCLY_CLI prefix, but this can be confusing when args name is the same for different commands in a single environment, but you need to use different values.

Reference

Closes: #1796

Testing

Screenshots (optional)

Check yourself

• Code changed? - Tested with redoc (internal)
• All new/updated code is covered with tests
• New package installed? - Tested in different environments (browser/node)

Security

• Security impact of change has been considered
• Code follows company security practices and guidelines

[changeset-bot]

🦋 Changeset detected

Latest commit: 46ad3d9

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 3 packages

Name	Type
@redocly/cli	Minor
@redocly/openapi-core	Minor
@redocly/respect-core	Minor

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[github-actions]

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
redocly lint packages/core/src/benchmark/benches/rebilly.yaml	953.0 ± 12.7	928.8	970.3	1.00
redocly-next lint packages/core/src/benchmark/benches/rebilly.yaml	1036.9 ± 29.0	997.2	1088.9	1.09 ± 0.03