Added includes [skip ci]

Author: ankane

examples/citus/example.cpp

@@ -1,6 +1,7 @@
+#include <cstdint>
 #include <iostream>
 #include <random>
-#include <cstdint>
+#include <vector>
 
 #include <pgvector/pqxx.hpp>
 #include <pqxx/pqxx>

examples/cohere/example.cpp

@@ -1,6 +1,8 @@
 #include <bitset>
 #include <cstdint>
 #include <iostream>
+#include <string>
+#include <vector>
 
 #include <cpr/cpr.h>
 #include <nlohmann/json.hpp>

examples/disco/example.cpp

@@ -5,6 +5,7 @@
 #include <sstream>
 #include <string>
 #include <unordered_map>
+#include <utility>
 
 #include <disco.hpp>
 #include <pgvector/pqxx.hpp>

examples/hybrid/example.cpp

@@ -3,6 +3,8 @@
 
 #include <cstdint>
 #include <iostream>
+#include <string>
+#include <vector>
 
 #include <cpr/cpr.h>
 #include <nlohmann/json.hpp>

examples/loading/example.cpp

@@ -1,5 +1,6 @@
 #include <iostream>
 #include <random>
+#include <vector>
 
 #include <pgvector/pqxx.hpp>
 #include <pqxx/pqxx>

examples/openai/example.cpp

@@ -1,4 +1,6 @@
 #include <iostream>
+#include <string>
+#include <vector>
 
 #include <cpr/cpr.h>
 #include <nlohmann/json.hpp>

examples/rdkit/example.cpp

@@ -1,3 +1,8 @@
+#include <iostream>
+#include <memory>
+#include <string>
+#include <vector>
+
 #include <DataStructs/ExplicitBitVect.h>
 #include <GraphMol/SmilesParse/SmilesParse.h>
 #include <GraphMol/Fingerprints/MorganFingerprints.h>

examples/sparse/example.cpp

@@ -7,6 +7,8 @@
 
 #include <cstdint>
 #include <iostream>
+#include <string>
+#include <vector>
 
 #include <cpr/cpr.h>
 #include <nlohmann/json.hpp>

include/pgvector/halfvec.hpp

@@ -7,6 +7,7 @@
 #pragma once
 
 #include <ostream>
+#include <utility>
 #include <vector>
 
 #if __cplusplus >= 202002L

include/pgvector/pqxx.hpp

@@ -11,6 +11,8 @@
 #include "vector.hpp"
 #include <pqxx/pqxx>
 #include <sstream>
+#include <string>
+#include <vector>
 
 /// @cond