Add host time platform; remove host support from sntp. (#6854)

esphome/components/host/time/__init__.py

@@ -0,0 +1,20 @@
+import esphome.codegen as cg
+from esphome.const import CONF_ID
+import esphome.config_validation as cv
+from esphome.components import time as time_
+
+CODEOWNERS = ["@clydebarrow"]
+
+time_ns = cg.esphome_ns.namespace("host")
+HostTime = time_ns.class_("HostTime", time_.RealTimeClock)
+CONFIG_SCHEMA = time_.TIME_SCHEMA.extend(
+    {
+        cv.GenerateID(): cv.declare_id(HostTime),
+    }
+).extend(cv.COMPONENT_SCHEMA)
+
+
+async def to_code(config):
+    var = cg.new_Pvariable(config[CONF_ID])
+    await cg.register_component(var, config)
+    await time_.register_time(var, config)