[SCB-638] Config model mechanism

[wujimin]

support get config value by priority or inject priority value to model

  @InjectProperties(prefix = "root")
  public static class ConfigWithAnnotation {
    @InjectProperty(prefix = "override", keys = {"high", "low"})
    public String strValue;

    @InjectProperty(keys = "${key}.value")
    public int intValue;

    @InjectProperty(keys = "${list-1}.a.${list-2}.b")
    public long longValue;

    @InjectProperty(keys = "${full-list}")
    public float floatValue;
}

[coveralls]

Coverage increased (+0.09%) to 86.032% when pulling 94b975c on wujimin:config-model-mechanism into 9040ec3 on apache:master.

[yhs0092]

Maybe we can remove the annotation @SuppressWarnings("unchecked") like below?

  static Property<Long> getLongProperty(String propName, Long defaultValue) {
    return new DynamicLongProperty(propName, defaultValue);
  }

[wujimin]

done

[yhs0092]

It seems that the backward placeholders have a higher priority. Does this meets your expectation?

[wujimin]

it's my expectation, but it's not correct
i'll fix it.

[wujimin]

done