[AI-4502] DDS: Sonicwall Firewall Integration (#18667)

* Add Sonicwall Integration

* rename changelog.d filename

* validate conf.yaml

* fix changelog build issue

* reset version

* update dashboard and pipeline

* updated pipeline and dashboards

* Added filters for Dashboards and fixed pipeline

* Updated pipeline with new changes

* Apply suggestions from code review comments

Co-authored-by: May Lee <may.lee@datadoghq.com>

* Update sonicwall_firewall/README.md

Updated suggested changes for README.md

Co-authored-by: May Lee <may.lee@datadoghq.com>

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Co-authored-by: kaustubhtandel-crest <kaustubh.tandel@crestdata.ai>
Co-authored-by: May Lee <may.lee@datadoghq.com> 1b0d18e