MDEV-11202 InnoDB 10.1 -> 10.2 migration does not work

This is the final preparation for the merge of MDEV-11623
from MariaDB Server 10.1 (correcting the assignment of
FSP_SPACE_FLAGS in MariaDB Server 10.1).

We must avoid reading FSP_SPACE_FLAGS directly from page 0,
because the flags that affect the uncompressed page size
cannot be trusted if we are upgrading from MariaDB 10.1.

We will pass fil_space_t* instead of a numeric tablespace ID
in many low-level functions, so that fil_space_t::flags
will be available. This will also reduce the amount o
tablespace ID lookups and the pressure on fil_system->mutex.

fil_space_is_being_truncated(), fil_space_is_redo_skipped(),
PageCallback::set_page_size(), fsp_header_get_page_size(): Remove.

fil_node_open_file(), fil_space_get_crypt_data(): Use space->flags.

fsp_free_extent(), fseg_get_first_extent(), fsp_get_space_header(),
xdes_get_descriptor_with_space_hdr(), xdes_get_descriptor(),
xdes_lst_get_descriptor(), fsp_space_modify_check(),
fsp_init_file_page(), fsp_alloc_free_extent(), fsp_page_create(),
fsp_alloc_free_page(), fsp_free_page(), fsp_alloc_seg_inode_page(),
fsp_alloc_seg_inode(), fsp_free_seg_inode(), fseg_fill_free_list(),
fseg_mark_page_used(), fseg_free_page_low(), fseg_free_extent():
Take fil_space_t* as a parameter, instead of taking a numeric ID.

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