feat: Add daily time partitioning to BigQuery event logging table

[vasilyl]

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Link to Issue or Description of Change

1. Link to an existing issue (if applicable):

• Closes: N/A
• Related: feat: Add BigQuery Agent Analytics Plugin #738

2. Or, if no issue exists, describe the change:

Problem:
Logging large volumes of events into a flat BigQuery table can lead to inefficient query scanning, resulting in slower analytical queries and higher query costs over time.

Solution:
Configure daily time partitioning during table creation inside NewBigQueryAgentAnalyticsPluginWithClients. The BigQuery table is created with TimePartitioning enabled on the timestamp field using bq.DayPartitioningType.

Testing Plan

Added unit test TestNewBigQueryAgentAnalyticsPlugin_CreateTable_WithPartitioning to verify that table creation requests correctly specify the partitioning parameters (timePartitioning with type DAY and field timestamp).

Checklist

• I have read the CONTRIBUTING.md document.
• I have performed a self-review of my own code.
• I have commented my code, particularly in hard-to-understand areas.
• I have added tests that prove my fix is effective or that my feature works.
• New and existing unit tests pass locally with my changes.
• I have manually tested my changes end-to-end.