Add counterpoll port-attr CLI support

[dhanasekar-arista]

What I did

Added counterpoll port-attr CLI commands to enable/disable/configure PORT_ATTR flex counter monitoring.

How I did it

• Added port_attr command group in counterpoll/main.py
• Implemented three subcommands:
  • enable: Sets FLEX_COUNTER_STATUS=enable in CONFIG_DB
  • disable: Sets FLEX_COUNTER_STATUS=disable in CONFIG_DB
  • interval <100-30000>: Sets POLL_INTERVAL in milliseconds (validated range)
• Integrated PORT_ATTR status into counterpoll show output

How to verify it

# Enable PORT_ATTR monitoring
counterpoll port-attr enable

# Set polling interval to 5 seconds
counterpoll port-attr interval 5000

# Verify configuration
counterpoll show

# Disable monitoring
counterpoll port-attr disable

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

Type                        Interval (in ms)    Status
--------------------------  ------------------  --------
QUEUE_STAT                  10000               enable
PORT_STAT                   1000                enable
PORT_BUFFER_DROP            60000               enable
RIF_STAT                    1000                enable
QUEUE_WATERMARK_STAT        10000               enable
PG_WATERMARK_STAT           10000               enable

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

Type                        Interval (in ms)    Status
--------------------------  ------------------  --------
QUEUE_STAT                  10000               enable
PORT_STAT                   1000                enable
PORT_BUFFER_DROP            60000               enable
PORT_ATTR            10000               enable
RIF_STAT                    1000                enable
QUEUE_WATERMARK_STAT        10000               enable
PG_WATERMARK_STAT           10000               enable

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