<i18n dev> RFR: JDK-8285932 Implementation of JEP-430 String Templates (Preview) [v19]

[Jim Laskey]

> Enhance the Java programming language with string templates, which are similar to string literals but contain embedded expressions. A string template is interpreted at run time by replacing each expression with the result of evaluating that expression, possibly after further validation and transformation. This is a [preview language feature and API](http://openjdk.java.net/jeps/12).

Jim Laskey has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains 33 additional commits since the last revision:

 - Merge branch 'master' into 8285932
 - Requested changes #7
   
   @Stable removal
   process decl in TemplateProcessor and StringProcessor for specialized javadoc
   clean up FormatterBuilder javadoc
 - Requested changes #5
 - Clean up new StringTemplate creation
   
   Centralized StringTemplate creation in StringTemplateImplFactory. Added consistent defensive copying of lists. Changed List<Object> to List<?> on StringTemplate.interpolate and StringTemplate.of.
 - Switch from anonymous classes  to carrier based StringTemplate implementation
 - Merge branch 'master' into 8285932
 - Internalize FormatConcatItem
 - Requested changes #5
 - Internalize TemplateSupport
 - Requested changes #4
 - ... and 23 more: https://git.openjdk.org/jdk/compare/bd45530e...c15142a3

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Changes:
  - all: https://git.openjdk.org/jdk/pull/10889/files
  - new: https://git.openjdk.org/jdk/pull/10889/files/2dc2cad2..c15142a3

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=10889&range=18
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=10889&range=17-18

  Stats: 3753 lines in 329 files changed: 2217 ins; 766 del; 770 mod
  Patch: https://git.openjdk.org/jdk/pull/10889.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/10889/head:pull/10889

PR: https://git.openjdk.org/jdk/pull/10889