⚙️ Add smart tracking config

[shantanuraj]

:star2: What does this PR do?

• 📦 Add base config fixture
• 🔧 Add config command
• 🔍 Add config lookup
• 👩‍🎨 Add config init command
• 📐 Refactor utilities
• 🩹 Fix description help not showing up

:bug: Recommendations for testing

• See recording for quick demo.
• Another recording shows how configuration is inherited by all child directories but not the ancestors of a tracked dir.
• Adds toggl config command to manage auto tracking configuration [^1].
• The focus of this PR is to implement a neat way to manage your auto-tracking configuration toml, and not the configuration itself.
• We also add a few fixtures to test the config logic at some point.
• The default configuration^2 is bundled into the binary.

New commands introduced

# Create a new configuration using the default bundled config
$ toggl config init

# Pretty print currently active configuration
$ toggl config

# Edit the configuration in the system's default editor
$ toggl config --edit # or toggl config -e

# Delete the active configuration for current directory
$ toggl config --delete # or toggl config -d

# Log the path of the active configuration file
$ toggl config --path # or toggl config -p

:memo: Links to relevant issues/docs

See #45 which defines the configuration storage and retrieval mechanism. Minor changes have been incorporated that differ from the original spec.

Instead of using md5(path) we use base64(path)

• because md5 usage is highly discouraged by the ecosystem.
• we don't need the file path to be hashed just encoded.
• another benefit is, that the encoded is reversible, so if we plan to add something like toggl config list to log all tracked paths; it would be trivial. Config files are stored in directories specified by the directories::ProjectDirs::from("studio.watercooler", "labs", "toggl-cli")[^3] method.

I've updated the spec to reflect these changes.

Current locations are

linux	windows	macOS
$XDG_CONFIG_HOME/toggl-cli or $HOME/.config/toggl-cli	{FOLDERID_RoamingAppData}/labs/toggl-cli/config	$HOME/Library/Application Support/studio.watercooler.labs.toggl-cli

:speech_balloon: Summarise how you feel about this PR with a gif/image

[^1]: Auto tracking RFC at #45

[^3]: For platform agnostic config directory calculation https://docs.rs/directories/5.0.0/directories/struct.ProjectDirs.html#method.config_dir

[shantanuraj]

A follow up to this would be a PR implementing a custom parsing logic for the toml files, that expands our macros. Finally after that we can incorporate the unrolled config into our time entry start commands.

[tcrammond]

Just chiming in that it's functioning beautifully for me 💅