update bsi-v2.0.0 fields values

[viveksahu26]

This PR adds the following changes:

• It include detailed fields of BSI TR-03183:2.0.0 fields, corresponding field in SPDX:2.3, SPDX:3.0 and CDX:1.6.
• This guide will act as a source of truth for our core implementation.
• Our logic should sync with it.
• In future for any changes, will update this and then core implementation.

This is related to issues: #591 #587 # in terms of theoritically for now. Many of the fields and respective are clear now after examples being shown for each field in BSI TR-03183:2.1.0
NOTE: It requires review.

[viveksahu26]

Hey @robin-s-007, have a looks at the fields of BSI:v2.0.0 and corresponding fields in SPDX/CDX for clarity. And then, we can we can sync it with our core logic implementation part.

[viveksahu26]

Hey @fvsamson, would love to hear your feedback into this. Since, the examples of each fields and their references in BSI TR-03183:2.0.0 are not shown, as well as even in BSI TR-03183:2.1.0, the fields ref for SPDX:2.3 are not shown, so possibly it could create confusion in mapping field especially wrt SPDX, so, your feedback would be really helpful here.

For more specifically, I need help for "confusion--clarification-needed": https://github.com/viveksahu26/sbomqs/blob/fix/bsi_2_0_issues/docs/reference/bsi-v2.0.0.md#confusion--clarification-needed-bsi-v200

[fvsamson]

@viveksahu26, thank you very much for bringing this up. As I am currently quite busy with other stuff, I would like to directly involve our SBOM specifications (i.e. CDX & SPDX) expert @ThomSei.