Handle param information from xml and json
- Added handilng to add description from BBF's DM xml file to converted json file.
- Change DM aggregation in temp txt file from CSV format to JSON
- Added "dm_json_files" in tools_input.json file to define the path of Json files having more details about DM parameters
- Added support to read DM param description from json plugin and update it in "datamodel_default.xml"
- Added support to read the description from defined "dm_json_files" in case description of param is not present in json plugin
- Added support to read the description from defined "dm_json_files" in case datamodel param defined in 'C' code
- Added enum and list type DM parameter in generated "datamodel_default.xml"