pgsql: add tests for no-failing on parsing error

Related to
Task #5524

tests/pgsql/pgsql-5524/README.md

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+# Test Description
+
+Check that pgsql app-proto parser is able to keep parsing even if it encounters
+unknown bodies, to consume known further PDUs.
+
+## PCAP
+
+PCAP extracted from a larger sample capture found on
+https://wiki.wireshark.org/PostgresProtocol: pgsql-jdbc.
+
+## Related issues
+
+https://redmine.openinfosecfoundation.org/issues/5524

tests/pgsql/pgsql-5524/suricata.yaml

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+%YAML 1.1
+---
+
+outputs:
+   - eve-log:
+       enabled: yes
+       filetype: regular #regular|syslog|unix_dgram|unix_stream|redis
+       filename: eve.json
+       types:
+         - pgsql:
+             enabled: yes
+         - flow
+
+app-layer:
+  protocols:
+    pgsql:
+      enabled: yes
+      # Stream reassembly size for PostgreSQL. By default, track it completely.
+      stream-depth: 0
+      # Maximum number of live PostgreSQL transactions per flow
+      # max-tx: 1024

tests/pgsql/pgsql-5524/test.yaml

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+requires:
+   min-version: 8
+args:
+- -k none
+- --set stream.midstream=true
+
+checks:
+- filter:
+    count: 1
+    match:
+      dest_ip: 127.0.0.1
+      dest_port: 5432
+      event_type: pgsql
+      pgsql.request.protocol_version: '3.0'
+      pgsql.request.startup_parameters.optional_parameters[0].database: test
+      pgsql.request.startup_parameters.optional_parameters[1].client_encoding: UNICODE
+      pgsql.request.startup_parameters.optional_parameters[2].date_style: ISO
+      pgsql.request.startup_parameters.optional_parameters[3].time_zone: US/Pacific
+      pgsql.request.startup_parameters.user: test
+      pgsql.response.message: authentication_ok
+      pgsql.response.parameter_status[0].client_encoding: UNICODE
+      pgsql.response.parameter_status[1].date_style: ISO, MDY
+      pgsql.response.parameter_status[2].is_superuser: 'on'
+      pgsql.response.parameter_status[3].server_version: 7.4.5
+      pgsql.response.parameter_status[4].session_authorization: test
+      pgsql.response.process_id: 30259
+      pgsql.response.secret_key: 2074654521
+      pgsql.tx_id: 1
+      proto: TCP
+      src_ip: 127.0.0.1
+      src_port: 57829
+- filter:
+    count: 1
+    match:
+      dest_ip: 127.0.0.1
+      dest_port: 5432
+      event_type: pgsql
+      pgsql.request.message: termination_message
+      pgsql.tx_id: 2
+      proto: TCP
+      src_ip: 127.0.0.1
+      src_port: 57829