Added Support for Middleware Functions in `piral-fetch`

[manuelroemer]

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Prerequisites

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• [x] I have read the CONTRIBUTING document
• [x] My code follows the code style of this project
• [x] All new and existing tests passed

Type(s) of Changes

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• [ ] Bug fix (non-breaking change which fixes an issue, please reference the issue id)
• [x] New feature (non-breaking change which adds functionality, make sure to open an associated issue first)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)
• [x] I have updated the documentation accordingly
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Description

Implements the proposed piral-fetch middleware changes from #645. See the issue for details.

Remarks

None.

[manuelroemer]

Ok, will do. IIRC the next title in the changelog should then be ## 1.4.1 (tbd), right? Let me know if not. ;)

[FlorianRappl]

Ok, will do. IIRC the next title in the changelog should then be ## 1.4.1 (tbd), right? Let me know if not. ;)

Yes that is right