Flatmerge clobbers metadata.component

Flatmerge clobbers metadata.component when the new metadata is initiated and the only sub-element that persists is metadata.tool.

https://github.com/CycloneDX/cyclonedx-dotnet-library/blob/b5fbaf66e4fcae632950744f66b7f37e41e2dcb3/src/CycloneDX.Utils/Merge.cs#L62

If you can advise on how this should be handled, I'm happy to create a pull request with the change. Possibly, convert metadata.component to a List and then merge like metadata.tool?

This bug is linked to the following issues

#https://github.com/CycloneDX/cyclonedx-cli/issues/218
#https://github.com/CycloneDX/cyclonedx-cli/issues/219

Start in src/CycloneDX.Utils/Merge.cs at line 62, where the metadata merge is reported to replace metadata.component while retaining metadata.tool. Review the linked cyclonedx-cli issues for the expected behavior, then verify that the chosen merge behavior preserves the intended metadata.component and metadata.tool values.

Written by the indexing model from the issue text.