Pretty API for parallel node execution

[tiginamaria]

Edit parallel node execution API:

• Remove transformation (if needed, it could be node inside the node)
• Combine parallel and merge node to one (as they can not leave without each other and make type more complex keeping them separate)

The new approach to define parallel nodes is:

val parallelNode by parallel(node1, node2, node3) {
     // Merge output and context
     selectBy {...}
}

[github-actions]

Qodana for JVM

249 new problems were found

Inspection name	Severity	Problems
Check Kotlin and Java source code coverage	🔶 Warning	216
Missing KDoc for public API declaration	🔶 Warning	17
Unused import directive	🔶 Warning	12
Vulnerable imported dependency	🔶 Warning	4

@@ Code coverage @@
+ 58% total lines covered
6534 lines analyzed, 3837 lines covered
# Calculated according to the filters of your coverage tool

☁️ View the detailed Qodana report

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[Ololoshechkin]

@tiginamaria please don't forget to notify the documentation changes