add metadata to tiff files

[Antsalacia]

Add id key from search catalog in tiff file metadata.

Closes #100

[AdrienWehrle]

Great thanks @Antsalacia ! Let's add some tests to check it works fine in different situations and we're good to go! 👍

[AdrienWehrle]

I think you've tested it on the example case given in the README, which is a perfect first step. However, this area is small, and split boxes are hence not used. Now we need to know how it behaves over larger areas where the ids of different split boxes are also included for a specific date.

Could you try with a bounding box like [-51.13, 68.99, -48.50, 69.42] and report how the metadata tags behave? As in, do you get one tag per split box? Or one per date?

Maybe try no more than two or three dates otherwise download will get expensive.

[Antsalacia]

I've tested with the bounding box provided and still had 1 tag per date. Test was done on those range ["2019-08-03", "2019-08-05"]