- use poetry-core for building

- Update to version 4.4.6
+ Promote the use of dedicated classes for dealing with OID-value pairs.
Instances of those classes resemble OBJECT-IDENTITY, OBJECT-TYPE and
+ Oneliner API reworked to become more generic: its LCD configuration
shortcuts and and var-bindings processing code split off SNMP apps
classes to stand-alone objects. The whole API also moved up in package
naming hierarchy and becomes ‘pysnmp.hlapi.asyncore’ (hlapi is
apparently an African fish). Old oneliner API remains fully operational
+ Synchronous oneliner apps redesigned to offer Python generator-based
+ Twisted API moved entirely into high-level domain to be aligned with
+ Sphinx documentation added to source code and example scripts. Library
+ Execution Observer facility implemented to give app an inside view of SNMP
(and modifying) various internal states of pysnmp engine. Previously
introduced non-standard APIs (like getting peer’s transport endpoint which
+ Responding to SNMP requests from exactly the same IP address the query
+ Internal oneliner apps configuration cache moved from respective apps
objects to [a singular] snmpEngine “user context” object. That would allow
for better cache reuse and allow for a single app working with many
+ Oneliner GETBULK Command Generator now strips possible excessive OIDs off
+ Constraints assignment shortcut added to some base rfc1902 types (Integer,
+ Examples on a single Transport Dispatcher use with multiple SnmpEngine
+ AbstractTransportDispatcher’s jobStarted() and jobFinished() methods now
+ Oneliner transport object now supports setLocalAddress() method to force
+ New public DgramSocketTransport.getLocalAddress() returns local endpoint
+ Change to rfc2576.v1tov2() logic: errorStatus = noSuchName is now
on the platform. It would help handling a really large number (>1024)
addV3User() functions as well as to their oneliner's wrappers.
in both Generator and Responder modes and better follow RFC2576