feat: add postgres icon

[grehnen]

For .plpgsql files

[github-actions]

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[PKief]

it's better to use the already existing database icon here, as the PostgreSQL is not so suitable to be used as file icon here:

[github-actions]

Merge Successful

Thanks for your contribution! 🎉

The changes will be part of the upcoming update on the marketplace.

[Ymirke]

Would love to have something in this style for postgres folders

[lucas-labs]

@Ymirke the problem with that is that the logo would be impossible to recognize when rendered at 16x16px. We would be rendering a complex logo in 8 squared pixels.

If what you really want is to be able to differentiate between let's say .plpgsql and .sql files, an alternative could be to use Icon Cloning assigning a different color for the .plpgsql file name extension.