Gh-308: Remove Guava dependency

[GCHQDeveloper314]

Related Issue

• Resolve #308

[codecov-commenter]

Codecov Report

Merging #309 (ca152d0) into develop (5b167b0) will decrease coverage by 0.05%. The diff coverage is 86.66%.

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@@              Coverage Diff              @@
##             develop     #309      +/-   ##
=============================================
- Coverage      82.20%   82.15%   -0.05%     
- Complexity      1618     1626       +8     
=============================================
  Files            194      194              
  Lines           4326     4338      +12     
  Branches         436      436              
=============================================
+ Hits            3556     3564       +8     
- Misses           591      594       +3     
- Partials         179      180       +1     

Impacted Files	Coverage Δ
.../java/uk/gov/gchq/koryphe/util/ReflectionUtil.java	80.00% <0.00%> (ø)
...in/java/uk/gov/gchq/koryphe/util/IterableUtil.java	75.00% <71.42%> (-5.00%)	:arrow_down:
...ryphe/serialisation/json/SimpleClassNameCache.java	68.61% <75.00%> (ø)
...a/uk/gov/gchq/koryphe/impl/function/FirstItem.java	100.00% <100.00%> (ø)
.../uk/gov/gchq/koryphe/impl/function/FirstValid.java	100.00% <100.00%> (ø)
.../gov/gchq/koryphe/impl/function/FunctionChain.java	100.00% <100.00%> (ø)
...ava/uk/gov/gchq/koryphe/impl/function/IsEmpty.java	100.00% <100.00%> (ø)
...va/uk/gov/gchq/koryphe/impl/function/LastItem.java	100.00% <100.00%> (ø)
...java/uk/gov/gchq/koryphe/impl/function/Length.java	98.00% <100.00%> (ø)
...ava/uk/gov/gchq/koryphe/impl/function/NthItem.java	100.00% <100.00%> (ø)
... and 14 more

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[GCHQDeveloper314]

Further work is needed and ideally Java 8 support should be dropped first, as it would be much easier to replace some methods by moving to Java 11 where they are built in.