Feature/ephemeral fs

[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

[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
✅ +0.32% (target: -0.10%)	✅ 99.07% (target: 70.00%)

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (252fdf0)	19235	16046	83.42%
Head commit (b5387de)	39186 (+19951)	32815 (+16769)	83.74% (+0.32%)

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 (#4368)	431	427	99.07%

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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