[Mellanox] Added CLI to show MPO interfaces mapping and status

[YairRaviv]

What I did

Added a new Mellanox CLI: show platform mlnx mpo-status that prints the Interfaces → MPO mapping for CPO ports, including per-port oper status.

How I did it

Single-ASIC:

• Read PORT from CONFIG_DB, filter CPO ports.
• For each CPO port, parse lanes and map lane ln to MPO floor(ln/4)+1 and Lane column (ln%4).
• Fetch oper_status from APPL_DB and print as EthernetX(UP|DOWN).

Multi-ASIC:

• For each ASIC namespace, read PORT from CONFIG_DB, filter the CPO ports, and fetch oper_status from APPL_DB.
• Compose MPO rows by index: MPO m uses the m-th CPO port from each ASIC in order (Lane1=asic0, Lane2=asic1, Lane3=asic2, Lane4=asic3).
• Print EthernetX/asicN(UP|DOWN).

How to verify it

By running "show platform mlnx mpo-status" command

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

show platform mlnx mpo-status
Single-ASIC:

+-------+-----------------+-----------------+-----------------+-----------------+
|   MPO | Lane 1          | Lane 2          | Lane 3          | Lane 4          |
+=======+=================+=================+=================+=================+
|     1 | Ethernet0(UP)   | Ethernet0(UP)   | Ethernet0(UP)   | Ethernet0(UP)   |
|     2 | Ethernet4(UP)   | Ethernet4(UP)   | Ethernet4(UP)   | Ethernet4(UP)   |
|     3 | Ethernet8(UP)   | Ethernet8(UP)   | Ethernet8(UP)   | Ethernet8(UP)   |
...
|   127 | Ethernet504(UP) | Ethernet504(UP) | Ethernet504(UP) | Ethernet504(UP) |
|   128 | Ethernet508(UP) | Ethernet508(UP) | Ethernet508(UP) | Ethernet508(UP) |
+-------+-----------------+-----------------+-----------------+-----------------+

Multi-ASIC:

show platform mlnx mpo-status
+-------+-----------------------+------------------------+------------------------+------------------------+
|   MPO | Lane 1                | Lane 2                 | Lane 3                 | Lane 4                 |
+=======+=======================+========================+========================+========================+
|     1 | Ethernet0/asic0(UP)   | Ethernet512/asic1(UP)  | Ethernet1024/asic2(UP) | Ethernet1536/asic3(UP) |
|     2 | Ethernet1/asic0(UP)   | Ethernet513/asic1(UP)  | Ethernet1025/asic2(UP) | Ethernet1537/asic3(UP) |
...
|   511 | Ethernet510/asic0(UP) | Ethernet1022/asic1(UP) | Ethernet1534/asic2(UP) | Ethernet2046/asic3(UP) |
|   512 | Ethernet511/asic0(UP) | Ethernet1023/asic1(UP) | Ethernet1535/asic2(UP) | Ethernet2047/asic3(UP) |
+-------+-----------------------+------------------------+------------------------+------------------------+

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