Template rendering performance issue has been fixed

[tarampampam]

Description

Fixed

• Performance issue, that affects template rendering. Now templates are cached in memory (for 2 seconds), and it has improved performance by more than 200%

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I wrote unit tests for my code (if tests is required for my changes)
• I have made changes in CHANGELOG.md file

[codecov]

Codecov Report

Merging #60 (44d2213) into master (690a405) will increase coverage by 4.11%.
The diff coverage is 72.65%.

@@            Coverage Diff             @@
##           master      #60      +/-   ##
==========================================
+ Coverage   38.76%   42.88%   +4.11%     
==========================================
  Files          31       32       +1     
  Lines        1024     1138     +114     
==========================================
+ Hits          397      488      +91     
- Misses        596      617      +21     
- Partials       31       33       +2     

Impacted Files	Coverage Δ
internal/cli/build/command.go	0.00% <0.00%> (ø)
internal/http/core/errorpage.go	0.00% <0.00%> (ø)
internal/http/handlers/errorpage/handler.go	0.00% <0.00%> (ø)
internal/http/handlers/index/handler.go	0.00% <0.00%> (ø)
internal/http/server.go	0.00% <0.00%> (ø)
internal/tpl/render.go	74.80% <83.83%> (+24.80%)	⬆️
internal/tpl/hasher.go	100.00% <100.00%> (ø)
internal/tpl/properties.go	100.00% <100.00%> (ø)

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[tarampampam]

Сache size must be limited, otherwise, there will be memory leaks (e.g. with unique RequestID in props)

[tarampampam]

Cache items now have a TTL