Add a simplified saving API for common use cases

[tlnagy]

Currently, the saving API is extremely limited. Users can add tags to the IFDs to save a description or change the compression, etc. This is clunky and hard to use. It would be better to expose keywords for common properties such that you do the following:

img = rand(Gray{N0f8}, 10, 10)
TiffImages.save("img.tif", img; description = "test image", compression = :lzw)

Naturally, if the user is supplying a subtype of AbstractTIFF we would need a way to merge the provided tag values with the tags already present in the IFD of the image.

Some properties that I can imagine being useful to set this way are:

• bigtiff
• description
• compression
• orientation
• X/Y resolution

Basically the API used in the ImageJ demo: https://tamasnagy.com/TiffImages.jl/dev/demos/common/imagej/#Writing-ImageJ-compatible-metadata should be easier to use/discover. We should still allow for the nitty gritty fine grained control of that example, but have a simpler option for folks too.

Thoughts @chrstphrbrns with regards to compression?