feat: Support --date flag for tmpo log and tmpo stats

[DylanDevelops]

Pull Request Checklist

• I have read and followed the contribution guidelines.
• My pull request targets the main branch of tmpo.
• I have tested these changes locally on my machine.

Closes #91

Description

This pull request adds support for filtering history logs and statistics by a specific date in both the log and stats commands. It introduces a new --date (or -d) flag, allowing users to view entries or stats for a user-specified date. The implementation also includes logic to handle different date formats based on user configuration.

New date filtering functionality:

• Added a --date (-d) flag to both the log and stats commands to allow filtering entries or statistics for a specific date (cmd/history/log.go, cmd/history/stats.go). [1] [2] [3] [4]

Command logic updates:

• Updated the log command to check for the logDate flag and retrieve entries within the specified date range using the new flag (cmd/history/log.go).
• Updated the stats command to check for the statsDate flag and compute statistics for the specified date, displaying the date in a user-friendly format (cmd/history/stats.go).

Date parsing improvements:

• Implemented a parseDateFlag helper function to parse the date input according to the user's configured date format, with fallback and error messaging (cmd/history/log.go).

These changes improve usability by allowing users to easily filter logs and stats by any date, not just today or this week.