fix: APPLY MIGRATION parser + add std/tables import to server.nim

- Fixed parseApplyMigration to use p.expect(tkApply) instead of p.expect(tkIdent)
- Added std/tables import to server.nim for Row table operations
- All 216 tests pass + 15/15 integration tests pass

src/barabadb/core/server.nim

@@ -2,6 +2,7 @@
 import std/asyncdispatch
 import std/asyncnet
 import std/strutils
+import std/tables
 import std/os
 import std/endians
 import config