Add IFEU holidays

[benjfield]

Proposed change

I have added the base IFEU holidays which are used both for the exchange and for settlement pricing for products including Brent Futures and Low Sulphur Gasoil Futures.

Type of change

• New country/market holidays support (thank you!)
• Supported country/market holidays update (calendar discrepancy fix, localization)
• Existing code/documentation/test/process quality improvement (best practice, cleanup, refactoring, optimization)
• Dependency update (version deprecation/upgrade)
• Bugfix (non-breaking change which fixes an issue)
• Breaking change (a code change causing existing functionality to break)
• New feature (new python-holidays functionality in general)

Checklist

• I've followed the contributing guidelines
• I've run make pre-commit, it didn't generate any changes
• I've run make test, all tests passed locally

[coveralls]

Pull Request Test Coverage Report for Build 9132506804

Details

• 21 of 21 (100.0%) changed or added relevant lines in 3 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 100.0%

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Totals
Change from base Build 9131535412:	0.0%
Covered Lines:	11190
Relevant Lines:	11190

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💛 - Coveralls

[arkid15r]

Hi @benjfield

Thanks for the clean code PR! I don't have much suggestions after glancing the PR.
Apparently, we need to update the supported markets section of the README.rst fle

I'll take another look later today.

Thanks again for your contribution!

[arkid15r]

Could you also include IFEU snapshot (see make snapshot command)?

Thank you!

[arkid15r]

LGTM

Any suggestions @KJhellico

[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
0.0% Duplication on New Code

See analysis details on SonarCloud

[KJhellico]

LGTM!