add `cargo install` ci

[ivinjabraham]

Description:

A Github workflow that runs cargo install --path . as well as cargo install patch-hub (if and when patch-hub is published to crates.io) to ensure that the commit did not break installation.

Motivation:

Even though we already have a workflow to run cargo build, cargo install does not use the lock file to determine version info. This can lead to different versions being installed and therefore has a chance of breaking as it did in #119.

[davidbtadokoro]

UPDATE

With PR #125, the check of cargo install --path . is covered, so it leaves to uncomment the crates.io job for when we add patch-hub there.