Add support for multiple `scanPaths` in report generation

[jayasuryat]

Right now MendableReportGeneratorRequest only supports a single String scan path.

mendable/mendable/src/main/java/com/jayasuryat/mendable/MendableReportGeneratorRequest.kt

Lines 32 to 40 in 0009acc

	@Poko
	public class MendableReportGeneratorRequest(
	public val scanPath: String,
	public val outputPath: String,
	public val scanRecursively: Boolean,
	public val outputFileName: String,
	public val exportType: ExportType,
	public val includeModules: IncludeModules,
	) {

And as different projects would have different ways of generating and storing the metrics, having a single scan path will force the library consumers to either have all of the metrics generated in a single folder, or scan a much bigger parent folder recursively to fit the single scan path requirement. Which isn't ideal.

Instead, it is better to change the primary constructor to take in a list of scan paths, and add a secondary constructor with a single scan path (which will ultimately call the primary constructor with a list of only one scan path) to maintain source-compatibility.

---

TODO:

• Update MendableReportGeneratorRequest to accommodate for multiple scan paths
• Make MendableReportGeneratorRequest backwards-source-compatible
• Update MendableReportGenerator to handle multiple scan paths
• Update tests to check this behaviour change
• Update CliArgs to take in multiple scan paths
• Add new tests in CliArgumentsTest to test the change in behaviour
• Update README.md to inform about this change
• Update docs on GitHub pages to inform about this change
• Dump and validate API changes
• Deprecate methods added for backwards-source-compatibility