Rule 5.1.1: Avoid too long functions, no more than 30 lines (non-empty, non-comment)

[kentr0w]

Actions checklist

• Implemented Rule, added Warnings
• Added tests on checks
• [] Added tests on fixers
• Updated diktat-analysis.yml
• Updated available-rules.md
• closes Rule 5.1.1 Avoid too long functions, no more than 30 lines (non-empty, non-comment) #335

[codecov]

Codecov Report

Merging #341 into master will increase coverage by 0.03%.
The diff coverage is 85.71%.

@@             Coverage Diff              @@
##             master     #341      +/-   ##
============================================
+ Coverage     82.82%   82.86%   +0.03%     
- Complexity     1132     1142      +10     
============================================
  Files            56       57       +1     
  Lines          2836     2860      +24     
  Branches        908      915       +7     
============================================
+ Hits           2349     2370      +21     
  Misses          162      162              
- Partials        325      328       +3     

Flag	Coverage Δ	Complexity Δ
#unittests	82.86% <85.71%> (+0.03%)	1142.00 <10.00> (+10.00)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ	Complexity Δ
...at-rules/src/main/kotlin/generated/WarningNames.kt	0.00% <ø> (ø)	0.00 <0.00> (ø)
...tlin/org/cqfn/diktat/ruleset/utils/AstNodeUtils.kt	82.82% <83.33%> (+0.17%)	0.00 <0.00> (ø)
...in/org/cqfn/diktat/ruleset/rules/FunctionLength.kt	85.00% <85.00%> (ø)	10.00 <10.00> (?)
...tlin/org/cqfn/diktat/ruleset/constants/Warnings.kt	96.90% <100.00%> (+0.03%)	9.00 <0.00> (ø)
...cqfn/diktat/ruleset/rules/DiktatRuleSetProvider.kt	97.87% <100.00%> (+0.04%)	3.00 <0.00> (ø)

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[petertrr]

LGTM