Update global name typespec

Introduce is_map_key/2 guard BIF

OTP-15037

This complements the `map_get/2` guard BIF introduced in #1784.

Rationale.

`map_get/2` allows accessing map fields in guards, but it might be
problematic in more complex guard expressions, for example:

foo(X) when map_get(a, X) =:= 1 or is_list(X) -> ...

The `is_list/1` part of the guard could never succeed since the
`map_get/2` guard would fail the whole guard expression. In this
situation, this could be solved by using `;` instead of `or` to separate
the guards, but it is not possible in every case.

To solve this situation, this PR proposes a `is_map_key/2` guard that
allows to check if a map has key inside a guard before trying to access
that key. When combined with `is_map/1` this allows to construct a
purely boolean guard expression testing a value of a key in a map.

Implementation.

Given the use case motivating the introduction of this function, the PR
contains compiler optimisations that produce optimial code for the
following guard expression:

foo(X) when is_map(X) and is_map_key(a, X) and map_get(a, X) =:= 1 -> ok;
foo(_) -> error.

Given all three tests share the failure label, the `is_map_key/2` and
`is_map/2` tests are optimised away.

As with `map_get/2` the `is_map_key/2` BIF is allowed in match specs.

* siri/kernel/logger/OTP-13295:
  Add documentation of the built-in logger handlers
  Catch badarg in logger:get_format_depth/0
  Add chars_limit option to logger_formatter
  Don't kill logger process until all other processes are dead
  Set call timeout for logger_server to infinity
  Update primary bootstrap
  Test cuddle for logger
  Update cth_log_redirect to a logger handler
  Start using logger internally in kernel and stdlib
  Remove error_logger process and add logger process
  Add logger

* hasse/stdlib/rfc3339_datetime/OTP-14764:
  stdlib: Add RFC 3339 functions to module calendar

Allow installing multiple instances of sys debug function

This commit solves a bug which allowed installing {Fun,State} as sys debug function even if Fun was already installed. This happened in the case when the current State of the debug fun was undefined.

Also, the new format {Id,Fun,State} of debug functions can be installed, allowing multiple instances of the same fun.

[stdlib/sys.erl] Fix sys module's debug statistics not including the out message count when using gen_server:call/2.

OTP-15047

Functions for converting between RFC 3339 strings and system time
are added.

Options are lists, but we are considering using maps instead. If we
change, it will happen after Erlang/OTP 21.0-rc1 is released.