Crate habit_tracker_parser

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The parser will interpret each row of the raw Habito records using custom grammar rules that capture the following components:

Habit Number and Description: Each line begins with a habit’s number and its description, separated by a colon and space.
- Example: 9: write 15 pages or 10: workout
Goal Metric: Following the habit description is a metric representing the goal or frequency of the habit, recorded in decimal format.
- Example: 15.0 for “write 15 pages” or 1.0 for “workout.”
Time Period: This is a summary of the time period over which the habit has been tracked, usually represented as a string like “1 day” or “2 days.”
Completion Statuses: The final part of each record is a list of boxes (□ and ■) representing each day’s habit completion. An empty box (□) represents an incomplete day, while a filled box (■) signifies a completed day.
- Example: □ □ ■ □ □ □ □ □ □ indicates the habit was completed only once.

The parser will recognize each part of the record based on positional patterns and character types:

Number & Description: Parse up to the first colon : as an identifier and then capture the text until the metric.
Metric: Identify as a float or decimal number immediately after the description.
Time Period: A string following the metric with a unit indicating “day(s).”
Completion Statuses: A sequence of empty □ and filled ■ checkboxes, counted for calculating success rates.

Given an example record:

│ 9: write 15 pages │ 15.0 │ 1 days │ □ □ ■ □ □ □ □ □ □ │ 
│ 10: workout │ 1.0 │ 2 days │ ■ ■ □ □ □ □ □ □ □ │

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