Add `BreakpointStore` to debugger crate #744

Job	Run time
(Linux) Build Remote Server	0s
(macOS) Run Clippy and tests	0s
Check Postgres and Protobuf migrations, mergability	0s
(Linux) Run Clippy and tests	0s
Check formatting and spelling	0s
(Windows) Run Clippy and tests	0s
Create a macOS bundle	0s
Linux x86_x64 release bundle	0s
Linux arm64 release bundle	0s
Auto release preview	0s
	0s

Provide feedback