Add Method field to RequestAttributes

Allows AuthHandler implementations to differentiate between Allocate,
Refresh, CreatePermission, and ChannelBind requests for custom auth
policies (e.g. applying TTL checks only on initial allocation).

Better bind error log

Include received error code in returned error

Only send requested-family for ipv6 allocations

Fixed channel number reuse, added server logs (pion#541)

Do not delete the client-side binding when a ChannelBind transaction
fails. This keeps the channel number stable for a peer even if
a response is lost, preventing "same peer, different channel" rebind
attempts.

Server already has channel-bind conflict detection implemented
and handled it silently. Added server warning logs in ChannelBind
handling to help discover and debug similar issues in the future.

Relase v5.0.0

Upgrade to pion/transport/v4

Handle stale nonces in ChannelBind

And add timer to renew bindings

Wrapped TURN errors (pion#480)

* Wrapped TURN Allocation/Permission errors

Fix lint issues with golangci-lint@v2

Add a quota handler callback

This PR adds a quota handler callback function which, if specified, is
called by the server just before making an allocation for a user. The
handler should return a single bool: if true then the allocation
request can proceed, otherwise the request is rejected with a 486
(Allocation Quota Reached) error.