Fix addresses truncation

Fix long addresses truncated: replace old belle_sip_object_marshal method by belle_sip_object_to_string in sal_address_as_string and sal_address_as_string_uri_only in order to no be limited by a buffer size. This prevent a crash when the call get a bad uri.

https://linphone.atlassian.net/browse/SDK-808?focusedCommentId=20675&sourceType=mention

linphone-sdk!5393 (merged)

!3740 (merged)