Add Fortigate port and switch table

[UTXOnly]

What does this PR do?

• Adds support for FORTINET-FORTIGATE-MIB fgSwDeviceTable and fgSwPortTable
  • enables monitoring of managed switch ports and switch resource usage tagged by switch_name and switch_serial

Motivation

• Zendesk support case #2013960

Review checklist (to be filled by reviewers)

• Feature or bugfix MUST have appropriate tests (unit, integration, e2e)
• Add the qa/skip-qa label if the PR doesn't need to be tested during QA.
• If you need to backport this PR to another branch, you can add the backport/<branch-name> label to the PR and it will automatically open a backport PR once this one is merged

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.29%. Comparing base (1cc5061) to head (7cc8467).
Report is 176 commits behind head on master.

Additional details and impacted files

Flag	Coverage Δ
activemq	?
cassandra	?
celery	?
hive	?
hivemq	?
ignite	?
jboss_wildfly	?
presto	?
snmp	95.72% <100.00%> (?)
solr	?

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[NouhaManai96]

looks good once tests are updated and are passing

Review from urseberry is dismissed. Related teams and files:

• documentation
  • snmp/tests/compose/data/fortinet-fortigate.snmprec