Integrate snapshot management

[bartolomej]

Idea

Newer versions of flow-cli now support blockchain snapshot management. Integrate snapshot management into Flowser, so that a user can manage (create, view, delete, revert to) flow emulator snapshots directly from Flowser app.

Resources

• https://docs.onflow.org/flow-cli/snapshot-save
• https://docs.onflow.org/emulator/#managing-emulator-state

[bartolomej]

Snapshot management is integrated, as of https://github.com/onflowser/flowser/releases/tag/v2.0.0-beta.