Add support for parsing Collections and Maps from the Spring YML format

[akang31]

Add support for understanding the Spring YML (YamlPropertiesFactoryBean) way of parsing YML files via the Archaius endpoints. This supports the ConfigProxy and PropertyRepository as these all are eventually backed by AbstractConfig.

This enables all existing Archaius read methods to read multi-line/multi-property maps and arrays as specified by Spring.

Spring YML files are converted to configs from this yml file

test:
    map:
        key1: 1
        key2: 2
        key3: 3
    stringList:
        - a
        - b
        - c

To these configs:

test.map.key1=1
test.map.key2=2
test.map.key3=3
test.stringList[0]=a
test.stringList[1]=b
test.stringList[2]=c

[rgallardo-netflix]

Maybe move these two to be private static helper methods in AbstractConfig? Then things would work with any ParametrizedType, not just with ArchaiusType.

[akang31]

Good call, moved these into the AbstractConfig instead

[rgallardo-netflix]

I think this is almost there!
Could you add tests for ... ?

• Reading these through a config proxy
• Reading a non-string yml value (ie, something like key: 1 with an unquoted int)
• No regressions when reading the raw mapNamePrefix.mapKey as a "normal" key

[akang31]

I think this is almost there! Could you add tests for ... ?

• Reading these through a config proxy
• Reading a non-string yml value (ie, something like key: 1 with an unquoted int)
• No regressions when reading the raw mapNamePrefix.mapKey as a "normal" key

Added some more tests to address these cases