Kestrel-lang

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Added
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- standalone Kestrel config module to support modular and simplified Kestrel config loading flow
- shareable-state of config between Kestrel session and any Kestrel data source interfaces
- stix-shifter interface upgraded with shareable-state of config support
- stix-shifter DEBUG level env var ``KESTREL_STIXSHIFTER_DEBUG``
- stix-shifter config/profile loading from disk ``~/.config/kestrel/stixshifter.yaml``
- debug message logging in ``kestrel_datasource_stixshifter``
- documentation for Kestrel main config with default config linked/shown

Changed
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- default Kestrel config not managed by ``pip`` any more
- turn main Kestrel from TOML into YAML ``~/.config/kestrel/kestrel.yaml``
- upgrade Kestrel data source interfaces API with new ``config`` parameter
- default stix-shifter debug level to INFO
- documentation upgrade for ``kestrel_datasource_stixshifter``

Fixed
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- Kestrel config upgrade inconsistency 116

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Added
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- advanced code auto-completion with parser support

Fixed
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- dollar sign incorrectly display in Jupyter Notebook (dataframe to html)

Changed
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- installation documentation upgrade

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Changed
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- dependency version bump for the open hunting stack (Black Hat Europe 2021)
- installation documentation updates

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Added
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- multi-data source support
- detailed error message from stix-shifter

Fixed
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- Limit Python<=3.9 since numpy is not ready for 3.10

==================

Added
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- GROUP BY multiple attributes
- Aggregation function in GROUP BY
- Support alias in GROUP BY
- New test cases for GROUP BY
- Documentation update for GROUP BY

==================

Fixed
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- Aggregated entity recognition in a variable after command GROUP