Allow building with native-tls instead of rustls

[jirutka]

Bundling (static linking) TLS library is a very bad idea from a security perspective and linux distributions try to avoid it.

[codecov-commenter]

Codecov Report

Merging #258 (12e387e) into master (728bf25) will decrease coverage by 0.00%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #258      +/-   ##
==========================================
- Coverage   94.21%   94.20%   -0.01%     
==========================================
  Files         454      454              
  Lines       16341    16343       +2     
==========================================
+ Hits        15395    15396       +1     
- Misses        946      947       +1     

Impacted Files	Coverage Δ
duckscript_sdk/src/sdk/std/net/ftp/get/mod.rs	89.28% <0.00%> (-1.79%)	⬇️
duckscript_sdk/src/sdk/std/net/ftp/list/mod.rs	97.05% <0.00%> (+0.08%)	⬆️
duckscript_sdk/src/sdk/std/net/ftp/nlst/mod.rs	97.05% <0.00%> (+0.08%)	⬆️

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[sagiegurari]

@jirutka thanks a lot. i got a lot of requests to stop using the native openssl due to installation difficulties, but i see no harm in giving both options.