Add Number entities (from Home Assistant) (#1971)

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

script/ci-custom.py

@@ -559,6 +559,7 @@ def lint_inclusive_language(fname, match):
         "esphome/components/display/display_buffer.h",
         "esphome/components/i2c/i2c.h",
         "esphome/components/mqtt/mqtt_component.h",
+        "esphome/components/number/number.h",
         "esphome/components/output/binary_output.h",
         "esphome/components/output/float_output.h",
         "esphome/components/sensor/sensor.h",