Fixes to key generation & Plaintext operations

In this release, key generation procedure is put in compliance with a standard ElGamal implementation (as you can find e.g. in OpenPGP). Also, we added new APIs for multiplication, division and exponentiation by a plaintext (c * k, c / k, c^k, where k is plaintext).

Expose key structs

Public keystruct (#27)

* Public keystruct

* access to encryption parameters

* minor

Co-authored-by: bazzilic <bazzilic@gmail.com>

Performance optimizations

Performance optimizations (#26)

* perf optimisations

* deps version bump

Update dependencies

0.10.2

Update dependencies

Initial GitHub NuGet Release

v0.10.1

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