Core/Authserver: Re-organize the accounts table (PR #25135)

- no longer use sha_pass_hash for anything else core-side (.account, SOAP, RA)
- salt/verifier/session_key are now binary
- old s/v/sha_pass_hash fields kept around for backwards compatibility
- sha_pass_hash is still updated (for now), s/v are not
- sha_pass_hash is only read if s/v have been manually changed
- SRP6 b now uses the full 32 bytes of randomness (instead of randomly only using 19)

(cherry picked from commit 3164b58c7d)

src/server/database/Database/Field.cpp

@@ -16,6 +16,7 @@
  */
 
 #include "Field.h"
+#include "Errors.h"
 #include "Log.h"
 #include "MySQLHacks.h"
 
@@ -247,6 +248,12 @@ std::vector<uint8> Field::GetBinary() const
     return result;
 }
 
+void Field::GetBinarySizeChecked(uint8* buf, size_t length) const
+{
+    ASSERT(data.value && (data.length == length), "Expected %zu-byte binary blob, got %sdata (%u bytes) instead", length, data.value ? "" : "no ", data.length);
+    memcpy(buf, data.value, length);
+}
+
 void Field::SetByteValue(char const* newValue, uint32 length)
 {
     // This value stores raw bytes that have to be explicitly cast later