Send a DHCP client name (Wifi component)

**Describe the problem you have/What new integration you would like**

ESPHome does not set a client name when it sends a DHCP request. The name (or a custom config option) should be sent in the DHCP request.

**Please describe your use case for this integration and alternatives you've tried:**

The client name is very helpful: You see in the access point which devices are connected. And you can use the hostname of the device to communicate with it instead of an IP.

**Additional context**

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Start by locating the ESPHome Wifi component and its DHCP request handling. Done means the device sends a client name, or a configurable value, in the DHCP request so access points and hostname-based communication can identify it.

Written by the indexing model from the issue text.