[feat] Feat/caching auth

[St4NNi]

A basic / crude implementation of caching / authorization including path traversal.

• Check contexts of requests
• Check user permissions based on cached values
• Decode Tokens based on pubkeys

[codecov]

Codecov Report

Patch coverage: 31.33% and project coverage change: +3.48% 🎉

Comparison is base (67e1d59) 14.47% compared to head (b3377d2) 17.96%.
Report is 3 commits behind head on feat/version2.0rework.

Additional details and impacted files

@@                    Coverage Diff                    @@
##           feat/version2.0rework      #96      +/-   ##
=========================================================
+ Coverage                  14.47%   17.96%   +3.48%     
=========================================================
  Files                         35       36       +1     
  Lines                       2721     3022     +301     
=========================================================
+ Hits                         394      543     +149     
- Misses                      2327     2479     +152     

Files Changed	Coverage Δ
src/auth/permission_handler.rs	0.00% <0.00%> (ø)
src/auth/structs.rs	0.00% <0.00%> (ø)
src/auth/token_handler.rs	0.00% <0.00%> (ø)
src/database/dsls/mod.rs	0.00% <0.00%> (ø)
src/database/dsls/pub_key_dsl.rs	0.00% <0.00%> (ø)
src/grpc/collections.rs	0.00% <0.00%> (ø)
src/grpc/datasets.rs	0.00% <0.00%> (ø)
src/grpc/notification.rs	0.00% <0.00%> (ø)
src/grpc/object.rs	0.00% <0.00%> (ø)
src/grpc/projects.rs	0.00% <0.00%> (ø)
... and 8 more

... and 2 files with indirect coverage changes

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[das-Abroxas]

Nothing obviously wrong. Let's go 🚀