feat(commands): add add_reminder command

[Akinator31]

This pull request introduces a new reminders feature to the codebase, allowing users to schedule reminders via both slash and text commands. It includes the necessary database migration, query definitions, command implementations, and user feedback mechanisms. Additionally, it updates help documentation to reflect the new functionality and ensures configuration compatibility.

Reminders Feature Implementation:

• Database Schema and Queries:

  • Adds a new reminders table with relevant fields and foreign key constraints via a migration (migrations/20251007111259_create_reminders_table.sql).
  • Introduces new SQLx query definitions for inserting, updating, and selecting reminders (.sqlx/query-8d256f5308e9c3af3f409d5097302f9794287b06f89da6c7f4a86efcd37b151a.json, .sqlx/query-1f2332afc3824ca0790ef097ff1d48074feaa48de9844e0e30d7e6fe96ad5e44.json, .sqlx/query-b9420d5d850bf8fc05beb8594611533139e47e3df927153e8cb15fe7451fdc4b.json). [1] [2] [3]

• Command Implementations:

  • Implements the reminders feature for both slash and text commands, including parsing, validation, and scheduling logic (src/commands/add_reminder/slash_command/add_reminder.rs, src/commands/add_reminder/text_command/add_reminder.rs). [1] [2]
  • Provides shared logic for confirmation messages and reminder spawning (src/commands/add_reminder/common.rs).
  • Adds module structure for the new commands (src/commands/add_reminder/mod.rs, src/commands/add_reminder/slash_command/mod.rs, src/commands/add_reminder/text_command/mod.rs). [1] [2]

• User Feedback and Documentation:

  • Updates help command output to include the new !add_rap (add reminder) command in both slash and text help messages (src/commands/help/slash_command/help.rs, src/commands/help/text_command/help.rs). [1] [2]

Configuration and Dependency Updates:

• Configuration:

  • Ensures ReminderConfig is included in test and default configuration setups (src/commands/edit/common.rs). [1] [2]

• Dependencies:

  • Adds the regex crate to Cargo.toml to support time parsing for reminders.

These changes collectively enable users to set reminders, store them persistently, and receive notifications at the scheduled time, with robust user feedback and integration into the existing command system.