feat(license): add struct with types for licenses

[DmitriyLewen]

Description

To exclude prefixes for licenses, add a new License structure with types:

• file
• Name
• non-separable

This structure will be needed for subsequent analysis of these licenses (if necessary).

[DmitriyLewen]

We already have file:// prefix.

Perhaps we want to create new struct for License field.

just as idea:

type License struct {
	Value string
	Type  licenseType
}

type licenseType string

const (
	fileLicenseType             licenseType = "file" // filename for license file
	textLicenseType             licenseType = "text" // text of license (for split, classifier, etc.)
	nonSeparableTextLicenseType licenseType = "nonSeparable-text" // text of license without possible to split
	formattedLicenseType        licenseType = "formattedLicenses" // formatted licenses (e.g. in SPDX format)
)

[knqyf263]

It sounds reasonable. We can go with that approach.

[DmitriyLewen]

@knqyf263 I have added licenseType to this PR.
I also updated aquasecurity/trivy#5211 to show the required changes for Trivy.
#5211 requires some refactoring. I will do this if you confirm that we are ready for these changes.

[DmitriyLewen]

I was thinking about checking license classifiers before license, but in this case we might miss some nuances (like license exclusion).
So I left the old order.

[lior-orca]

@DmitriyLewen is this going to be picked up again soon? :)
Thanks in advance!

[DmitriyLewen]

Hello @lior-orca
We need to wait for @knqyf263's decision.

@knqyf263 Can you take a look at these changes?

[knqyf263]

Please give me some more time. I have some prioritized tasks.

[lior-orca]

@knqyf263 any updated? :)
cc @DmitriyLewen

[lior-orca]

@DmitriyLewen any updates on this one?

[DmitriyLewen]

Hello @lior-orca
We decided to add a new structure for licenses - #256 (comment).
So I'm working on that now.