Add ability to read value from Stdin

[infamousjoeg]

Is your feature request related to a problem? Please describe.
Cannot pipe to conceal to add value as secret value.

Describe the solution you'd like

cybr accounts list | jq -r '.value[] | select(.userName=="aws-cli") | .platformAccountProperties.AWSAccessKeyID' | conceal set test/test

Describe alternatives you've considered
n/a

Additional context
n/a

[infamousjoeg]

Added in v4