Rename default PCIe metrics for better readability

[koshieguchi]

Closes #354

Description

This PR updates the default PCIe metric from DCGM_FI_DEV_PCIE_{TX,RX}_THROUGHPUT to DCGM_FI_PROF_PCIE_{TX,RX}_BYTES in ./etc files to align with the DCGM Documentation (Version 3.3).

Background

According to the DCGM Documentation, DCGM_FI_DEV_PCIE_{TX,RX}_THROUGHPUT is deprecated and should be replaced with DCGM_FI_PROF_PCIE_{TX,RX}_BYTES. This change resolves issues reported in Issue #167.

Changes Made

• Replaced DCGM_FI_DEV_PCIE_{TX,RX}_THROUGHPUT with DCGM_FI_PROF_PCIE_{TX,RX}_BYTES in ./etc/default-counters.csv.

References

• DCGM Documentation - DCGM API Field IDs
• Issue #167 - Get DCGM_FI_DEV_PCIE_TX_THROUGHPUT metric failed

[koshieguchi]

@glowkey Have added a GPG signature to my commit! Thanks for the review!