feat: support aliases in CLI flag, env and config

[knqyf263]

Description

This PR adds support for aliases in CLI flag, env and config. Currently, CLI flag is only supported, but others are not. Also, it shows deprecation messages for deprecated aliases.

CLI flag

Before

$ trivy image --security-checks vuln alpine:3.17
2023-01-24T11:57:47.570Z        INFO    Vulnerability scanning is enabled

After

$ trivy image --security-checks vuln alpine:3.17
2023-01-24T11:57:47.570Z        WARN    '--security-checks' is deprecated. Use '--scanners' instead.
2023-01-24T11:57:47.570Z        INFO    Vulnerability scanning is enabled

Env

$ TRIVY_SECURITY_CHECKS=vuln trivy image alpine:3.17
2023-01-25T11:30:12.090+0200    WARN    'TRIVY_SECURITY_CHECKS' is deprecated. Use 'TRIVY_SCANNERS' instead.

Config

$ trivy image alpine:3.17
2023-01-25T11:30:46.062+0200    INFO    Loaded trivy.yaml
2023-01-25T11:30:46.064+0200    WARN    'scan.security-checks' in config file is deprecated. Use 'scan.scanners' instead.

Related PRs

• refactor: rename security-checks to scanners #3467

Checklist

• I've read the guidelines for contributing to this repository.
• I've followed the conventions in the PR title.
• I've added tests that prove my fix is effective or that my feature works.
• I've updated the documentation with the relevant information (if needed).
• I've added usage information (if the PR introduces new options)
• I've included a "before" and "after" example to the description (if the PR is a user interface change).