Replace SecureTemporaryFiles with an EphemeralFile implementation based on ChaCha20

[evilaliv3]

With this pull request i would like to propose:

• Replacement of SecureTemporaryFiles based on AES with EphemeralFile based on ChaCha20
• Addition of the globaleaks-eph-fs command that we might use to instantiate an ephemeral filesystem when integrating ClamAV and MAT2

[evilaliv3]

@msmannan00 : When you like please feel free to proceed with the review of this pull request.

[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
❌ -69.70% (target: +0.50%)	❌ 4.39% (target: 70.00%)

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (852b292)	19236	16038	83.37%
Head commit (46abef2)	28738 (+9502)	3930 (-12108)	13.68% (-69.70%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#4367)	433	19	4.39%

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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[evilaliv3]

Actually i missed to add the libraries! Going to fix it fist before opening for review.

Thank you!

[msmannan00]

Yes will do so thanks