First commit for event index

Walkthrough

Recent updates across multiple files primarily focus on integrating an _EVENT_INDEX column for enhanced event indexing throughout various functions. These changes include adjustments in import statements, data processing logic, and output summaries to accommodate this new column, enabling sophisticated event tracking and processing capabilities in the aggregate.py, extract_subtree.py, predicates.py, and types.py files, while ensuring tests are updated accordingly.

Changes

Files/Groups	Change Summary
`src/aces/aggregate.py`	Altered imports, added `_EVENT_INDEX` handling in functions such as `aggregate_temporal_window`, `aggregate_event_bound_window`, and `boolean_expr_bound_sum`. Dropping the `_EVENT_INDEX` column after certain operations.
`src/aces/extract_subtree.py`	Added `_EVENT_INDEX` column in `extract_subtree` function, used it in processing logic, and included it in the output summary.
`src/aces/predicates.py`	Added `_EVENT_INDEX` column in `get_predicates_df` function output, modified the dataframe shape and creation logic.
`src/aces/types.py`	Defined `EVENT_INDEX_COLUMN`, `LAST_EVENT_INDEX_COLUMN`, and `EVENT_INDEX_TYPE`.
`tests/test_e2e.py`	Updated test cases to include `_LAST_EVENT_INDEX` fields with specific values.

Sequence Diagram(s)

sequenceDiagram
    participant User
    participant AggregateFunction as aggregate.py
    participant ExtractSubtreeFunction as extract_subtree.py
    participant PredicateFunction as predicates.py

    User->>AggregateFunction: Call aggregate_temporal_window(data)
    AggregateFunction->>AggregateFunction: Process data, use and drop _EVENT_INDEX
    User->>ExtractSubtreeFunction: Call extract_subtree(data)
    ExtractSubtreeFunction->>ExtractSubtreeFunction: Process data with _EVENT_INDEX
    User->>PredicateFunction: Call get_predicates_df()
    PredicateFunction->>PredicateFunction: Create and return dataframe with _EVENT_INDEX

Poem

In the land of data bright,
_EVENT_INDEX takes its flight,
Through code it weaves, a path so clear,
Enhancing logic, far and near.
With columns added, tests anew,
A stronger structure now in view.
🚀✨

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justin13601 / ACES