Built out ability to validate meta field names from xml files against filters using ExtractionTest

[sambish5]

This is in reference to NationalSecurityAgency/burrito-grande#968.
This change to ExtractionTest allows for xml meta fields to be compared to filters to validate that meta names exist within filters.

Instruction updated below.
#203 (comment)

[sambish5]

Updated the validation of the paramaters against the passed in filters. The filters have to be passed through the answer .xml. An example of this is included within TestValidateFieldExtractionTest.xml, but I will describe it here as well.

Two things must be included in the .xml to indicate what filters and meta field names you want checked:

1. In the section of the .xml, you must include:
   https://github.com/NationalSecurityAgency/emissary/pull/203/files#diff-7a0c74cff2741ef86493f708e8367d5d753b374c7cee46d75a661ad4731901abR3-R6
   (For Burrito filters, it needs to be formatted as <filter#>com.burrito.output.filters.LogFilter<filter#>)
   These allow the filters to be found through an InputStream.

2. For the individual meta field, you must include valdiateField="true" within the meta tag. If this is set to false or not included, the name will not be validated.

[cfkoehler]

Sonar recommends breaking this method up to reduce complexity. Parts can possible be abstracted out into helper methods.
Not a blocker but something to be aware of.