app_queue: Preserve reason for realtime queues

When Asterisk is restarted it does not preserve paused reason for
members of realtime queues. This was fixed for non-realtime queues in
ASTERISK_25732

Resolves: #66

UpgradeNote: Add a new column to the queue_member table:
reason_paused VARCHAR(80) so the reason can be preserved.

UserNote: Make paused reason in realtime queues persist an
Asterisk restart. This was fixed for non-realtime
queues in ASTERISK_25732.

contrib/ast-db-manage/config/versions/4042a0ff4d9f_add_reason_paused_to_queue_members.py

@@ -0,0 +1,22 @@
+"""add reason_paused to queue_members
+
+Revision ID: 4042a0ff4d9f
+Revises: 5a2247c957d2
+Create Date: 2022-12-21 14:24:48.885750
+
+"""
+
+# revision identifiers, used by Alembic.
+revision = '4042a0ff4d9f'
+down_revision = 'f261363a857f'
+
+from alembic import op
+import sqlalchemy as sa
+
+
+def upgrade():
+    op.add_column('queue_members', sa.Column('reason_paused', sa.String(80)))
+
+
+def downgrade():
+    op.drop_column('queue_members', 'reason_paused')