[gen3] reduce flash usage

[avtolstoy]

Description

1. Disables IPv6 support (can be turned back on), keeping things like AF_INET6, sockaddr_in6 and others available.
2. Disables CHAP for cellular devices (removes MD5 dependency) (this change needs to be verified cc @technobly, pretty sure we might just need to leave CHAP:<apn> and PAP will still work)
3. Disables IP reassembly/fragmentation on Tracker
4. Disables ESP32 NCP updates on Tracker
5. Disables text error messages
6. Disables TLS server support in MbedTLS (not used anywhere)
7. Disables float support in wiring Print in system. It's brought in only for setup console (over Serial), ideally the whole Print usage should be removed, but the changeset is big

With Ledger (#2660 and #2675) merged in, the state of affairs is the following (also lists some other potential future reductions):

Platform	Post Ledger merge free space	+ Serial setup console removed	+ Ethernet support disabled
Argon	45.8K	52K	-
Boron	16.4K	20.7K	-
B SoM	16.1K	20.4K	-
E SoM X	16.8K	21.2K	-
B5 SoM	21.6K	26.6K	-
Tracker	9.5K	13.8K	19K

[technobly]

Re: CHAP, Tested the only SIM this affects (one with user/pass) with Boron R410, R510, U201. All connect fine 👍🏼