Use OTP logger instead of lager.

Modernisations

* Add variable-length ClientHello
* Make it compile on OTP 27+
* Upgrade OTP versions in CI

* Use seriyps.com instead of .RU

* Support OTP-26, drop pre-otp-23
* Fix a few dialyzer warnings

* Migrate CI to Github actions, make sure it works on OTP-24 and OTP-25

* Handle situation when Telegram backend sends unexpected RPC (now it is `<<223,162,48,87>>` with 8 byte payload)

* Migrate to the newer Erlang versions

* Option to disable crc32 checks to save a bit of CPU
* Minor cleanups

* Maturing Fake-TLS

* Connection policies
* Configuration reload without downtime
* Better handle telegram servers disconnects
* Added option to close connections with RST

* Fix TLS to look like TLSv1.3

* Interactive installer script

* Fake TLS

* Codecs refactoring
* IPv6 for clients

* hex.pm related fixes

* use psq from hex.pm

* Multiplexing in master

* Replay attack protection
* Common tests
* Property-based tests