Add flagging functionality for moderation

[Atmois]

Description

Allows moderators to flag users who may be of concern, adding checks for if user is already flagged or not for each command. To be improved upon with better features for flagging in the future see #555 for more info. Emotes for flag and unflag need to be added aswell as they have just been given tempoary emojis.

PR also adds the functionality for cases to not be sent to a logging channel, improves when the handle_case_response is called for maintainability and improving the codebase and updates case embeds to properly convey information about a DM not being sent or a silent action.

Guidelines

• My code follows the style guidelines of this project (formatted with Ruff)

• I have performed a self-review of my own code

• I have commented my code, particularly in hard-to-understand areas

• I have made corresponding changes to the documentation if needed

• My changes generate no new warnings

• I have tested this change

• Any dependent changes have been merged and published in downstream modules

• I have added all appropriate labels to this PR

• [X] I have followed all of these guidelines.

How Has This Been Tested? (if applicable)

tested in tux dev

Screenshots (if applicable)

n/a

Additional Information

n/a

[sourcery-ai[bot]]

Reviewer's Guide by Sourcery

This pull request implements a new flagging functionality for moderation purposes, allowing moderators to flag and unflag users of concern. It also includes improvements to the case handling system, particularly in how case responses are handled and displayed.

File-Level Changes

Change	Details	Files
Added new flagging functionality for moderation	Implemented 'flag' and 'unflag' commands Created FlagFlags and UnFlagFlags classes for command flags Added methods to check if a user is flagged Updated case type emojis to include flag and unflag actions	tux/cogs/moderation/flag.py tux/cogs/moderation/unflag.py tux/utils/flags.py tux/cogs/moderation/cases.py
Improved case handling and response system	Added 'silent_action' parameter to handle_case_response method Updated case response embeds to properly convey information about DM status Modified when case responses are sent to the logging channel	tux/cogs/moderation/__init__.py tux/cogs/moderation/ban.py tux/cogs/moderation/jail.py tux/cogs/moderation/kick.py tux/cogs/moderation/snippetban.py tux/cogs/moderation/snippetunban.py tux/cogs/moderation/tempban.py tux/cogs/moderation/unban.py tux/cogs/moderation/unjail.py tux/cogs/moderation/untimeout.py tux/cogs/moderation/warn.py tux/cogs/moderation/timeout.py

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