[FEAT] Fetch all secrets in a given path

[mangatmodi]

Is your feature request related to a problem? Please describe.
I have many secrets in a vault path. For now I have to add all of them. If we add more in the future, we will also need to add them in the pipeline definition to avail it.

Describe the solution you'd like
Perhaps we can specify only the vault paths. The variables from the subsequent path overwrite the first one. For e.g -

path/to/a
path/to/b

Here variables from path/to/b will overwrite the same keys from path/to/a. Obviously users can not specify name for them.

I would happy to contribute the pull request if the community agree.

[nenad]

This enhancement seems similar to #234. A potential workaround might be #153 (comment)