🚀[FEA]: Convert current IFS source to IFS_FX and add IFS analysis source

[NickGeneva]

Is this a new feature, an improvement, or a change to existing functionality?

New Feature

How would you describe the priority of this feature request

Critical (currently preventing usage)

Please provide a clear description of problem you would like to solve.

Right now some of AIFS models need analysis only data from IFS to run.

Current IFS data source is only a forecast source which fails for the current models. We should rename the current IFS data source to IFS_FX and then add IFS which will be a proper data source of just the analysis data.