Use a source generator to generate the dynamic ids for message types (DB-69)

[timothycoleman]

Added: Source generator for dynamic message type ids

This saves on boilerplate code when adding new messages, but is also anticipated to be of use with the enhanced telemetry work

[gfoidl]

From a consumption perspective it's better to have the attributes defined in the "main"-code, not generated.

E.g. when you start a new project, then there's no attribute before the generator creates it. That can cause troubles with VS (even today).
Thus the common pattern (at least in dotnet-org) seems to be to have the needed attributes be parts of the shipped binaries, so the generator just "consumes" them.

[timothycoleman]

thanks! ive adjusted this

[gfoidl]

The generator should use incremental version.

The ISourceGenerator runs -- put simply -- on every keystroke, thus can slow down dev-experience on medium / large projects significantly. The incremental generator is more advanced, so that only on actual relevant change it's active. IMO also the programming model is more natural and aligned to how compilers work (parse and emit is more separated).

[timothycoleman]

thanks i'll take a look

[linear]

DB-69 Add checkpoint metrics