Add secrets engines abstraction#63

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damian-kwolek wants to merge 9 commits intoCSharpRU:developfrom

semergydev:feature/secret-engines

Commits on Jul 1, 2023

* Using correct Content-Type for PATCH method
Damian Kwolek
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* Allowing to json_encode BaseObject
Damian Kwolek
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* Added abstraction for Secret Engines
Damian Kwolek
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* Added Key/Value Version 1 implementation
Damian Kwolek
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* Added Key/Value Version 2 implementation
Damian Kwolek
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* Objectify response of kv1/list
Damian Kwolek
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* PHPDoc fixes
Damian Kwolek
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Commits on Jul 2, 2023

* Added section about secret engine overlays to documentation
Damian Kwolek
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* Fixed indentation
Damian Kwolek
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