Add support for round on non finite values

[hadrienk]

Non finite values are:

• Nan (0.0/0)
• +Infinity (-1.0/0)
• -Infinity (1.0/0)
• Null (missing)

When using round on non finite values the result should be returned unchanged.

• round(0.0/0, x) => 0.0/0
• round(-1.0/0, x) => -1.0/0
• round(1.0/0, x) => 1.0/0
• round(null, x) => null

For the floor function, since we do not support typed signature yet, the result need to be cast:

• floor(0.0/0, x) => 0
• floor(-1.0/0, x) => -9223372036854775808
• floor(1.0/0, x) => 9223372036854775807
• floor(null, x) => null

[codecov[bot]]

Codecov Report

Merging #84 into develop will increase coverage by 0.05%. The diff coverage is 100%.

@@             Coverage Diff             @@
##           develop      #84      +/-   ##
===========================================
+ Coverage    78.58%   78.64%   +0.05%     
===========================================
  Files          141      141              
  Lines         3577     3582       +5     
  Branches       419      420       +1     
===========================================
+ Hits          2811     2817       +6     
  Misses         642      642              
+ Partials       124      123       -1

Impacted Files	Coverage Δ
...ain/java/no/ssb/vtl/script/functions/VTLRound.java	100% <100%> (ø)	:arrow_up:
...del/src/main/java/no/ssb/vtl/model/VTLInteger.java	100% <100%> (ø)	:arrow_up:
...model/src/main/java/no/ssb/vtl/model/VTLFloat.java	100% <100%> (+16.66%)	:arrow_up:
...ain/java/no/ssb/vtl/script/functions/VTLFloor.java	100% <100%> (ø)	:arrow_up:

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