Create rule S6977: RLSE should be used in SPACE directive (#3922)

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Co-authored-by: antonioaversa <antonioaversa@users.noreply.github.com>
Co-authored-by: Antonio Aversa <antonio.aversa@sonarsource.com>
Co-authored-by: Gyula Sallai <gyula.sallai@sonarsource.com>

rules/S6977/jcl/metadata.json

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+{
+  "title": "RLSE should be used in SPACE directive",
+  "type": "CODE_SMELL",
+  "status": "ready",
+  "remediation": {
+    "func": "Constant\/Issue",
+    "constantCost": "5min"
+  },
+  "tags": [
+  ],
+  "defaultSeverity": "Major",
+  "ruleSpecification": "RSPEC-6977",
+  "sqKey": "S6977",
+  "scope": "All",
+  "defaultQualityProfiles": [],
+  "quickfix": "unknown",
+  "code": {
+    "impacts": {
+      "RELIABILITY": "MEDIUM"
+    },
+    "attribute": "EFFICIENT"
+  }
+}

rules/S6977/jcl/rule.adoc

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+== Why is this an issue?
+
+When the `RLSE` parameter is specified in a `SPACE` directive, the system releases unused space that has been allocated for the data set.
+
+Omitting this parameter can cause a waste of unneeded space reserved for the data set.
+
+== How to fix it
+
+=== Code examples
+
+==== Noncompliant code example
+
+[source,jcl,diff-id=1,diff-type=noncompliant]
+----
+//STEP1 EXEC PGM=IEFBR14
+//OUT1  DD  DSN=A.B.C,
+//          UNIT=3390,VOL=SER=Z19SPL,
+//          DISP=(NEW,CATLG),
+//          SPACE=(CYL,(1,1)) <-- Noncompliant
+----
+
+==== Compliant solution
+
+[source,jcl,diff-id=1,diff-type=compliant]
+----
+//STEP1 EXEC PGM=IEFBR14
+//OUT1  DD  DSN=A.B.C,
+//          UNIT=3390,VOL=SER=Z19SPL,
+//          DISP=(NEW,CATLG),
+//          SPACE=(CYL,(1,1),RLSE)
+----
+
+== Resources
+=== Documentation
+
+* IBM Documentation - https://www.ibm.com/docs/en/zos/3.1.0?topic=statement-space-parameter[SPACE parameter]
+* IBM Documentation - https://www.ibm.com/docs/en/zos/3.1.0?topic=definition-system-assignment-space[System assignment of space]
+

rules/S6977/metadata.json

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+{    
+}