[Fast-linkup] Added CLIs for config/show

[YairRaviv]

HLD: fast-link-up-hld.md

What I did

Implemented CLI for Fast-linkup feature including:

• config feature parameters
• enable/disable the feature per-port
• show feature parameters
• show interfaces feature status

How I did it

• By adding the new command support to config and show CLI

How to verify it

• Run Fast-linkup CLIs

Which release branch to backport (provide reason below if selected)

• 202511

New command output (if the output of a command-line utility has changed)

admin@sonic:/home/admin# show switch-fast-linkup global
+---------------+---------+
| Field         |   Value |
+===============+=========+
| ber_threshold |      10 |
+---------------+---------+
| guard_time    |      15 |
+---------------+---------+
| polling_time  |      60 |
+---------------+---------+

admin@sonic:/home/admin# show interfaces fast-linkup status
+-------------+---------------+
| Interface   | fast_linkup   |
+=============+===============+
| Ethernet0   | true          |
| Ethernet4   | true          |
| Ethernet8   | true          |
| Ethernet12  | false         |
| Ethernet16  | false         |
| Ethernet20  | false         |
| Ethernet24  | false         |
| Ethernet28  | false         |
| Ethernet32  | false         |
| Ethernet36  | false         |
| Ethernet40  | false         |
| Ethernet44  | false         |
| Ethernet48  | false         |
| Ethernet52  | false         |
| Ethernet56  | false         |
| Ethernet60  | false         |
| Ethernet64  | false         |
| Ethernet68  | false         |
| Ethernet72  | false         |
| Ethernet76  | false         |
| Ethernet80  | false         |
| Ethernet84  | false         |
| Ethernet88  | false         |
| Ethernet92  | false         |
| Ethernet96  | false         |
| Ethernet100 | false         |
| Ethernet104 | false         |
| Ethernet108 | false         |
| Ethernet112 | false         |
| Ethernet116 | false         |
| Ethernet120 | false         |
| Ethernet124 | false         |
+-------------+---------------+

[mssonicbld]

/azp run

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