[code-reflection] RFR: New example suite for code reflection [v2]

[Juan Fumero]

> New example suite for code reflection. It includes two programs that illustrate different functionality of the code reflection API. 
> 
> ### How to build?
> 
> This module is built using the code-reflection fork of OpenJDK. Then, update the `JAVA_HOME` to point to the code-reflection port, and compile with maven. In detail: 
> 
> #### 1. Build Babylon JDK
> 
> We need to use the JDK build that enables the code reflection API (Babylon).
> 
> 
> git clone https://github.com/openjdk/babylon 
> cd babylon
> bash configure --with-boot-jdk=${JAVA_HOME}
> 
> 
> Then, we use the built JDK as `JAVA_HOME`
> 
> 
> export JAVA_HOME=/$HOME/repos/babylon/build/macosx-aarch64-server-release/jdk/
> export PATH=$JAVA_HOME/bin:$PATH
> 
> 
> #### 2. Build the example suite
> 
> 
> mvn clean package
> 
> 
> #### 3. Run the examples
> 
> ##### Run HelloCodeReflection
> 
> 
> java --enable-preview -cp target/crsamples-1.0-SNAPSHOT.jar oracle.code.samples.HelloCodeReflection
> 
> 
> ##### Run MathOptimizer
> 
> 
> java --enable-preview -cp target/crsamples-1.0-SNAPSHOT.jar oracle.code.samples.MathOptimizer
> 
> 
> More example to appear in this module.

Juan Fumero has updated the pull request incrementally with one additional commit since the last revision:

  [samples] Example suite fixed with commets from PR#513

-------------

Changes:
  - all: https://git.openjdk.org/babylon/pull/513/files
  - new: https://git.openjdk.org/babylon/pull/513/files/49f5ef90..7ca5d4f8

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=babylon&pr=513&range=01
 - incr: https://webrevs.openjdk.org/?repo=babylon&pr=513&range=00-01

  Stats: 7 lines in 1 file changed: 0 ins; 5 del; 2 mod
  Patch: https://git.openjdk.org/babylon/pull/513.diff
  Fetch: git fetch https://git.openjdk.org/babylon.git pull/513/head:pull/513

PR: https://git.openjdk.org/babylon/pull/513