Include options.h in table.h (#6823)

Summary:
https://github.com/facebook/rocksdb/issues/6389 replaced the #include of options.h in table.h with forward declarations, which is causing some build failures in RocksDB users in 6.10. Remove the forward declarations and #include options.h as recommended by the style guide - https://google.github.io/styleguide/cppguide.html#Forward_Declarations
Pull Request resolved: https://github.com/facebook/rocksdb/pull/6823

Reviewed By: riversand963

Differential Revision: D21464078

Pulled By: anand1976

fbshipit-source-id: 6033ee2544d279690f57bb0db91bc83816cee11d

include/rocksdb/table.h

@@ -25,6 +25,7 @@
 #include "rocksdb/cache.h"
 #include "rocksdb/env.h"
 #include "rocksdb/iterator.h"
+#include "rocksdb/options.h"
 #include "rocksdb/status.h"
 
 namespace ROCKSDB_NAMESPACE {
@@ -40,11 +41,8 @@ class TableBuilder;
 class TableFactory;
 class TableReader;
 class WritableFileWriter;
-struct ColumnFamilyOptions;
 struct ConfigOptions;
-struct DBOptions;
 struct EnvOptions;
-struct Options;
 
 enum ChecksumType : char {
   kNoChecksum = 0x0,