Add missing LIQUIDATION_FORCED (LF) code to Code enum

[Copilot]

IBKR Flex XML statements use "LF" in Trade.notes for forced liquidation scenarios, but this code was undefined in the enum, causing parse failures.

Changes

• Added LIQUIDATION_FORCED = "LF" to Code enum (ibflex/enums.py)
• Added test case for Trade parsing with LF notes (tests/test_types.py)

The LF code represents "Forced Liquidation", indicating trades that were liquidated by IB (e.g., due to margin violations or other forced closures).

# Previously failed with: Can't convert 'LF' to <class 'tuple'>
trade = parser.parse_data_element(trade_element_with_notes_LF)  
# Now correctly parses as: trade.notes = (Code.LIQUIDATION_FORCED,)

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[vroonhof]

this code does not mean FIFO. Suggestion is that it means LIQUIDATION_FORCED

@copilot

[vroonhof]

address comment from conversation about naming

[Copilot]

this code does not mean FIFO. Suggestion is that it means LIQUIDATION_FORCED

@copilot

Corrected in commit 7a36e4b. Changed from FIFO to LIQUIDATION_FORCED with comment "Forced Liquidation".

address comment from conversation about naming

Fixed the naming issue in commit 7a36e4b. The enum is now LIQUIDATION_FORCED = "LF" instead of FIFO.