RSyslog should support KeepAlive options for imtcp and omfwd

Description

Relevant imtcp docs: https://www.rsyslog.com/doc/v8-stable/configuration/modules/imtcp.html
Relevant omfwd docs: https://www.rsyslog.com/doc/v8-stable/configuration/modules/omfwd.html

For the purpose of this ticket adding class params for the KeepAlive* variables for access via Hiera will suffice.

Acceptance Criteria

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Components

Affects versions

Priority

Medium
Configure