Add logic to log consumption of the openAI tokens and successful diagram's generation requests

[kislerdm]

What changed

• Persistence layer's DDL adjusted:
  • Prediction and raw prediction, tokens
  • Users table
  • API tokens table
  • Successful diagram generation tracking table

Why do we need it

• To keep costs under control
• To prepare for users authentication
• To prepare for quote tracking

[codecov-commenter]

Codecov Report

Merging #66 (4f3fa63) into master (b55848a) will increase coverage by 0.78%. The diff coverage is 96.96%.

@@            Coverage Diff             @@
##           master      #66      +/-   ##
==========================================
+ Coverage   89.70%   90.48%   +0.78%     
==========================================
  Files          15       15              
  Lines        1078     1167      +89     
==========================================
+ Hits          967     1056      +89     
  Misses         89       89              
  Partials       22       22              

Flag	Coverage Δ
cmd-httpserver	∅ <ø> (∅)
pkg-gcpsecretsmanager	77.35% <ø> (ø)
pkg-httpclient	100.00% <ø> (ø)
pkg-openai	90.95% <90.90%> (+1.33%)	:arrow_up:
pkg-postgres	93.95% <100.00%> (+2.95%)	:arrow_up:
root	89.69% <100.00%> (+0.19%)	:arrow_up:

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Impacted Files	Coverage Δ
server/core/pkg/openai/openai.go	90.95% <90.90%> (+1.33%)	:arrow_up:
server/core/config/config.go	100.00% <100.00%> (ø)
server/core/diagram/c4container/c4container.go	95.08% <100.00%> (+0.63%)	:arrow_up:
server/core/diagram/input.go	95.83% <100.00%> (ø)
server/core/diagram/ports.go	100.00% <100.00%> (ø)
server/core/pkg/postgres/postgres.go	93.95% <100.00%> (+2.95%)	:arrow_up:

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