[Build] Add Build description (continuation/reboot of #3263)

[tonhuisman]

Resolves #3262
Resolves #3263

Features:

• Display a "Build description" string in the System Info page, to be used by a future builder project
• Extension of the framework created in [Build] Add short compressed build description (#3262) #3263, adding feature flags, Notifiers and Network plugins
• Available in ESP32 and Custom builds (excluded from MINIMAL and most ESP8266 builds for size reasons)

Uses a bitmap notation encoded similar to IPv6 addresses (128 bits) (where 1 stream of multiple 0-bits are replaced by ::).
Prefixes:
P1 : Plugins part 1 (1..127)
P2 : Plugins part 2 (128..255)
T1 : Controllers part 1 (1..127) (T2 is supported but we don't have > 127 controllers 😅)
N1 : Notifiers part 1 (1..127) (N2 is supported but we don't have > 127 notifiers 😅)
W1 : Network drivers part 1 (1..127) (W2 is supported but we don't have > 127 network drivers 😅)
U1 : Feature flags part 1 (1..127) (U2 is supported but we don't have > 127 feature flags (yet) 😅)

Example: P1=fc7e:7bdb:de32:b920:1980:a0c0:2c0:c42:,P2=ab1:36c0:1710:1000::,T1=ffe8:200::,N1=c000::,W1=d000::,U1=deff:fb9a:4600::

TODO:

• Update FEATURE_* flags with the latest additions (Code has been stashed for some time 🫣)
• Update documentation
• Testing