Feature/nix support

[Lederstrumpf]

Referenced issues

Description of the Change

Implementation of nix shell/flake to build with nix package manager / NixOS.
Tries to strike a balance between Nix conventions and Kagome's current build workflow to be minimally invasive.
To test on NixOS or with the Nix package manager available, call nix develop in the root dir to instantiate a shell.

Possible Drawbacks

Checklist Before Opening a PR

Before you open a Pull Request (PR), please make sure you've completed the following steps and confirm by answering 'Yes' to each item:

1. Code is formatted: Have you run your code through clang-format to ensure it adheres to the project's coding standards? [Yes|No]
2. Code is documented: Have you added comments and documentation to your code according to the guidelines in the project's contributing guidelines? [Yes|No]
3. Self-review: Have you reviewed your own code to ensure it is free of typos, syntax errors, logical errors, and unresolved TODOs or FIXME without linking to an issue? [Yes|No]
4. Zombienet Tests: Have you ensured that the zombienet tests are passing? Zombienet is a network simulation and testing tool used in this project. It's important to ensure that these tests pass to maintain the stability and reliability of the project. [Yes|No]

[Lederstrumpf]

opening up for review since this now only requires the following cmake override:
https://github.com/qdrvm/kagome/pull/2257/files#diff-5751c8524018c8ba20b8f5103bc31e17914b309708616b6328ce867c82399313R34-R39

for this issue:

[ 29%] Building C object CMakeFiles/crypto.dir/crypto/asn1/a_type.c.o
[ 29%] Building C object CMakeFiles/crypto.dir/crypto/asn1/a_utctm.c.o
In file included from /nix/store/m3cz66vv8phy8ywkc7m99vjf0gdx5yyc-glibc-2.39-52-dev/include/string.h:548,
                 from /home/lederstrumpf/.hunter/_Base/f2d79db/4d672ab/b98f023/Build/BoringSSL/Source/crypto/asn1/a_bitstr.c:60:
In function ‘memcpy’,
    inlined from ‘OPENSSL_memcpy’ at /home/lederstrumpf/.hunter/_Base/f2d79db/4d672ab/b98f023/Build/BoringSSL/Source/crypto/asn1/../internal.h:1045:10,
    inlined from ‘i2c_ASN1_BIT_STRING’ at /home/lederstrumpf/.hunter/_Base/f2d79db/4d672ab/b98f023/Build/BoringSSL/Source/crypto/asn1/a_bitstr.c:130:3:
/nix/store/m3cz66vv8phy8ywkc7m99vjf0gdx5yyc-glibc-2.39-52-dev/include/bits/string_fortified.h:29:10: error: ‘__builtin_memcpy’ specified bound between 18446744071562067968 and 18446744073709551615 exceeds maximum object size 9223372036854775807 [-Werror=stringop-overflow=]
   29 |   return __builtin___memcpy_chk (__dest, __src, __len,
      |          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   30 |                                  __glibc_objsize0 (__dest));
      |                                  ~~~~~~~~~~~~~~~~~~~~~~~~~~
[ 30%] Building C object CMakeFiles/crypto.dir/crypto/asn1/asn1_lib.c.o
cc1: all warnings being treated as errors

if the related fix (https://github.com/qdrvm/boringssl/tree/fix/remove-werror) is merged into https://github.com/qdrvm/boringssl/tree/master, then I can also remove this override.