move read transforms into "source" package as FeatureSources

[tims]

First attempt #61

/donotmerge

/assign zhilingc

[tims]

/hold

[tims]

/assign pradithya

[tims]

/hold cancel

I think this is ready to merge now. This introduces breaking changes, for the import spec for file based imports, the "type" changes like so:

type: file, options: { format: csv} ----> type: file.csv
type: file, options: { format: json} ----> type: file.json

[tims]

@zhilingc @pradithya can you please review this?

[pradithya]

I think this is ready to merge now. This introduces breaking changes, for the import spec for file based imports, the "type" changes like so:

type: file, options: { format: csv} ----> type: file.csv
type: file, options: { format: json} ----> type: file.json

I think core will also need to change since it check for the import spec before submitting it, correct @zhilingc ?

[tims]

updated core import spec validator class

[pradithya]

/lgtm

[zhilingc]

Seems good. You're missing the license in some of the files though.
/approve

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