btrfs: add generic workspace manager initialization

This involves:

- Add (alloc|free)_workspace_manager helpers.
  These are the helper to alloc/free workspace_manager structure.

  The allocator will allocate a workspace_manager structure, initialize
  it, and pre-allocate one workspace for it.

  The freer will do the cleanup and set the manager pointer to NULL.

- Call alloc_workspace_manager() inside btrfs_alloc_compress_wsm()
- Call alloc_workspace_manager() inside btrfs_free_compress_wsm()
  For none, zlib and lzo compression algorithms.

For now the generic per-fs workspace managers won't really have any effect,
and all compression is still going through the global workspace manager.

Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

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