alter: implement ability to set compression for tuple fields

Implement ability to set compression for tuple fields. Compression type
for tuple fields is set in the space format, and can be set during space
creation or during setting of a new space format.
```lua
format = {{name = 'x', type = 'unsigned', compression = 'none'}}
space = box.schema.space.create('memtx_space', {format = format})
space:drop()
space = box.schema.space.create('memtx_space')
space:format(format)
```
For opensource build only one compression type ('none') is
supported. This type of compression means its absence, so
it doesn't affect something.

Part of #2695

NO_CHANGELOG=stubs for enterprise version
NO_DOC=stubs for enterprise version