notation sign/verify to work with local storage

[dtzar]

Implement notation to work with signatures in the local storage/filesystem.

[sajayantony]

Sharing a proposal here - https://hackmd.io/5PmzMOcrSRaCUJzuy_Gbhg
@gokarnm @toddysm @shizhMSFT

[toddysm]

@FeynmanZhou @yizha1 @vaninrao10 is this something we can consider for rc.2?

[dtzar]

@toddysm - the bigger user story is set for RC2, but needs more clarity on scope. Please comment more on this thread which aspect of "local" you desire.

[yizha1]

Update the milestone to rc-3 based on the discussion.