PR for adding functionality to parse additional interface configuration using ShowRunInterface

[akanxap]

Description

Added functionality in show_run.py ShowRunInterface class to parse additional lines of config - dot1x timeouts (supp_timeout, ratelimit_period), dot1x source template, ipv6_nd_raguard, spanning_tree_guard, and switchport for voice vlan.

Motivation and Context

This change helps us parse the additional lines using genieparser, and helps us get complete characteristics of an interface configuration. Previously, we weren't able to use this parser to check whether an interface is dot1x (802.1x) configured or not, now we can.

Impact (If any)

No negative impact

Screenshots:

Checklist:

• I have updated the changelog.
• I have updated the documentation (If applicable).
• I have added tests to cover my changes (If applicable).
• All new and existing tests passed.
• All new code passed compilation.