Add locking mechanism to handle concurrent operations.

[marfvr]

Is your feature request related to a problem? Please describe.

Currently, there is no guarantee that concurrent aea commands will end in a consistent project state.

Describe the solution you'd like

Implement locking mechanism to allow that.

Describe alternatives you've considered n/a

Additional context

https://en.wikipedia.org/wiki/Concurrency_control#Concurrency_control_mechanisms