Review drools-examples and drools-examples-api

[tkobayas]

Review drools-examples and drools-examples-api. Remove or fix outdated ones.

drools-examples is also included in drools-distribution, so this issue is related to #6161

[tkobayas]

WIP: Reviewed drools-examples-api. All good. These examples uses deprecated drools-engine-classic, but it's convenient to demonstrate.

drools-examples-api is explained in https://docs.drools.org/latest/drools-docs/drools/KIE/index.html#_kieexamplessection

[tkobayas]

WIP: Reviewing drools-examples

Old docs cover more examples description : https://docs.drools.org/6.2.0.Final/drools-docs/html/ch20.html

DroolsBenchmarkExamplesApp : GUI for WaltzBenchmark and WaltzDbBenchmark
WaltzBenchmark : benchmark
WaltzDbBenchmark : benchmark
DroolsExamplesApp : GUI for other examples
HouseOfDoomMain : Backward chaining
BankingExamplesApp : balance
BirdsFlyExample : TMS
BussPassBadExample, BussPassGoodExample, BussPassJTMSExample : TMS
CashFlowMain : balance
CircularTmsExample : TMS
PricingRuleDTExample : DecisionTable
DiagnosticsExample : TMS
FibonacciExample : recursion
FireExample, FireLogicalExample : TMS
GolfingExample : CSP
HelloWorldExample : debug log
HonestPoliticianExample : TMS
PerformanceExample : performance test. Issue: build error
PetStoreExample : agenda-group
ShoppingExample : TMS
StateExampleUsingAgendaGroup, StateExampleUsingSalience : agenda-group, salience
SudokuExample : complex rules. Issue: immediately solved
TraitExample : trait
TroubleTicketExample, TroubleTicketExampleWithDSL, TroubleTicketExampleWithDT : duration, DSL, DecisionTable
TextAdventure : Game
Invaders6Main : Game
NumberGuessMain : Game
PongMain : Game. Issue: not working
WumpusWorldMain : Game