trexe: Support ro or rw input paths

Before raising this MR, consider whether the following are required, and complete if so:

• Unit tests
• Metrics
• Documentation update(s)

Description

Allow trexe to upload input trees with ro or rw permission. Only unix_mode of regular files are affected, not directories.

With CLI, it will be local/path:remote/path:ro. This is similar to docker run -v.

With a config file, it will be

[input-path]
local = "/local/path"
remote = "remote/path"
file-permission = "rw"

Changes proposed in this merge request:

• Parse the optional permission setup
• Mask the file permission of input trees if needed
• If the permission is not configured, for backward compatibility, unix_mode will not be captured (and changed)
• Refactor File and FileNodeMetaData classes to support the new property during merging

Validation

Will also add an e2e test after MR being merged.