Bring DHCP Options to the UI

### Prerequisites

- [X] I have checked the [Wiki](https://github.com/AdguardTeam/AdGuardHome/wiki) and [Discussions](https://github.com/AdguardTeam/AdGuardHome/discussions) and found no answer

- [X] I have searched other issues and found no duplicates

- [X] I want to request a feature or enhancement and not ask a question

### The problem

DHCP Options are available in the configuration (yaml file)
using the [dhcp.dhcpv4.options ](https://github.com/AdguardTeam/AdGuardHome/wiki/DHCP#the-dhcpdhcpv4options-array-field) array field

In some cases it is not possible to edit this file, for some even to difficult
unfortunately a widely used implementation of AdGuard Home, Home Assistant Addon, for example, makes it impossible to access the yaml file.
nevertheless i believe the options should be available via the web interface in any case

These options are used for multiple purposes but PXE is one of the most often mentioned
although #1585 #2573 #6575 do briefly mention the UI as means to configure the DHCP options, no request was opened asking this specifically

### Proposed solution

Provide fields or a text box to add DHCP options in the DHCP part of the web interface of AdGuard Home
So the functionality is easier to use and becomes more accessible to a wider audience
and even replacing the dhcp.dhcpv4.options yaml config (or side by side)

### Alternatives considered and additional information

_No response_