Add initial tests for WS positioned after RegExp literal

src/regexp-insignificant-ws/000A-escaped.case

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+// Copyright (C) 2021 Leo Balter. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+desc: 000A (LF)
+esid: prod-RegularExpressionLiteral
+template: default
+---*/
+
+//- character
+\u000A

src/regexp-insignificant-ws/000D-escaped.case

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+// Copyright (C) 2021 Leo Balter. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+desc: 000D (RF)
+esid: prod-RegularExpressionLiteral
+template: default
+---*/
+
+//- character
+\u000D

src/regexp-insignificant-ws/default/after.template

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+// Copyright (C) 2021 Leo Balter. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+path: language/literals/regexp/
+name: WhiteSpace character positioned after
+esid: prod-RegularExpressionLiteral
+info: |
+  In the ECMAScript lexical grammar, WhiteSpace is defined to include ASCII
+  tab/vertical tab/form feed/space, nonbreaking space, BOM/zero-width
+  nonbreaking space, and any code point with the Unicode property
+  “Space_Separator”, and LineTerminator is any of U+000A LINE FEED, U+000D
+  CARRIAGE RETURN, U+2028 LINE SEPARATOR, and U+2029 PARAGRAPH SEPARATOR. Both
+  are required to be insignificant in between expression tokens
+---*/
+
+/.//*{ character }*/;