MDEV-8250: InnoDB: Page compressed tables are not compressed and compressed+encrypted tables cause crash

Analysis: Problem is that both encrypted tables and compressed tables use
FIL header offset FIL_PAGE_FILE_FLUSH_LSN_OR_KEY_VERSION to store
required metadata. Furhermore, for only compressed tables currently
code skips compression.

Fixes:
- Only encrypted pages store key_version to FIL header offset FIL_PAGE_FILE_FLUSH_LSN_OR_KEY_VERSION,
  no need to fix
- Only compressed pages store compression algorithm to FIL header offset FIL_PAGE_FILE_FLUSH_LSN_OR_KEY_VERSION,
  no need to fix as they have different page type FIL_PAGE_PAGE_COMPRESSED
- Compressed and encrypted pages now use a new page type FIL_PAGE_PAGE_COMPRESSED_ENCRYPTED and
  key_version is stored on FIL header offset FIL_PAGE_FILE_FLUSH_LSN_OR_KEY_VERSION and compression
  method is stored after FIL header similar way as compressed size, so that first
  FIL_PAGE_COMPRESSED_SIZE is stored followed by FIL_PAGE_COMPRESSION_METHOD
- Fix buf_page_encrypt_before_write function to really compress pages if compression is enabled
- Fix buf_page_decrypt_after_read function to really decompress pages if compression is used
- Small style fixes

mysql-test/suite/encryption/t/innodb-page_encryption_compression.test

@@ -6,6 +6,7 @@
 let $innodb_compression_algorithm_orig=`SELECT @@innodb_compression_algorithm`;
 let $innodb_file_format_orig = `SELECT @@innodb_file_format`;
 let $innodb_file_per_table_orig = `SELECT @@innodb_file_per_table`;
+let $encryption = `SELECT @@innodb_encrypt_tables`;
 --enable_query_log
 
 SET GLOBAL innodb_file_format = `Barracuda`;
@@ -124,4 +125,5 @@ drop table innodb_dynamic;
 EVAL SET GLOBAL innodb_compression_algorithm = $innodb_compression_algorithm_orig;
 EVAL SET GLOBAL innodb_file_per_table = $innodb_file_per_table_orig;
 EVAL SET GLOBAL innodb_file_format = $innodb_file_format_orig;
+EVAL SET GLOBAL innodb_encrypt_tables = $encryption;
 --enable_query_log