Add FXMacroData data collector

[roberttidball]

Summary

• add a daily FX spot-rate collector for FXMacroData under scripts/data_collector/fxmacrodata
• document download, normalize, and dump_bin.py conversion steps
• add collector requirements and list the collector in the data_collector README

Notes

The collector maps each daily FX spot rate to qlib-compatible open, high, low, and close fields, with volume=0, factor=1, and change calculated from close-to-close returns.

Validation

• python -m py_compile scripts\data_collector\fxmacrodata\collector.py
• python -m flake8 --ignore=E402 scripts\data_collector\fxmacrodata\collector.py
• mocked collector/normalizer check for pair parsing, rate shaping, and output columns
• git diff --check

The CLI help check was not run in the minimal local venv because qlib's shared collector base imports the full local qlib package dependency chain. The mocked check stubs only qlib.utils.code_to_fname, which is the helper used by BaseCollector for this path.

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