Add templates for escaped and unescaped 'yield' and 'await' as identifiers

src/async-generators/await-as-label-identifier.case

src/async-generators/syntax/async-class-decl-method.template

...generators/syntax/async-class-decl-static-method.template

src/async-generators/syntax/async-class-expr-method.template

...generators/syntax/async-class-expr-static-method.template

src/async-generators/syntax/async-declaration.template

src/async-generators/syntax/async-expression-named.template

src/async-generators/syntax/async-expression.template

src/async-generators/syntax/async-obj-method.template

...async-generators/yield-as-binding-identifier-escaped.case

src/async-generators/yield-as-binding-identifier.case

...ync-generators/yield-as-identifier-reference-escaped.case

src/async-generators/yield-as-identifier-reference.case

src/async-generators/yield-as-label-identifier-escaped.case

src/async-generators/yield-as-label-identifier.case

src/generators/syntax/class-decl-method.template

src/generators/syntax/class-decl-static-method.template

src/generators/syntax/class-expr-method.template

src/generators/syntax/class-expr-static-method.template

src/generators/syntax/declaration.template