feat: Add license Apache-2.0
Adds license Apache-2.0 to the crates which contains the resources licensed under the Apache-2.0.
I did some research, since we don't actually include any code that is apache 2.0 but we import it via cargo the separatation is already handled there and we don't need to add additional license text as far as I understand.
@LucioFranco
It does not contain the source codes itself, but it contains "Object" at generated directories in the following sense:
"Object" form shall mean any form resulting from mechanical transformation or translation of a Source form, including but not limited to compiled object code, generated documentation, and conversions to other media types.
https://www.apache.org/licenses/LICENSE-2.0.html