feat: scan maven aggregate projects

[gitphill]

• [X] Follows CONTRIBUTING rules

What does this PR do?

See https://github.com/snyk/snyk-mvn-plugin/pull/136

Introduces --maven-aggregate-project so that we can support Maven module scanning better. Until now if modules depend on each other we would error out when using --all-projects. This new flag uses the Maven reactor and a compile phase to correctly scan the entire project using one Maven command, passing back a multi scan result to the CLI.

Added a Maven tip if we detect a Maven project with multiple manifests and no relevant options being used.

[github-actions[bot]]

	Warnings
:warning:	Since the CLI is unifying on a standard and improved tooling, we're starting to migrate old-style imports and exports to ES6 ones. A file you've modified is using either module.exports or require(). If you can, please update them to ES6 import syntax and export syntax. Files found: src/cli/args.ts

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