Add Select for modbus (#3032)

Co-authored-by: Oxan van Leeuwen <oxan@oxanvanleeuwen.nl>

esphome/cpp_types.py

@@ -15,6 +15,7 @@ uint16 = global_ns.namespace("uint16_t")
 uint32 = global_ns.namespace("uint32_t")
 uint64 = global_ns.namespace("uint64_t")
 int32 = global_ns.namespace("int32_t")
+int64 = global_ns.namespace("int64_t")
 const_char_ptr = global_ns.namespace("const char *")
 NAN = global_ns.namespace("NAN")
 esphome_ns = global_ns  # using namespace esphome;