[Dot Shorthands] DAP Implementation

[kallentu]

This issue tracks the work needed to update the debug adapter protocol (DAP) to support dot shorthands.

Do we need any work here for the new feature?

cc. @elliette @DanTup

[DanTup]

I don't think there's anything in DAP that would be affected by this, but it may depend on whether there are any related VM Service changes.

@derekxu16 I see in #59875 there's some entries about expression evaluation - do you think there would be any changes that could affect (or need implementing) in DAP?

[derekxu16]

I think the answer is likely no, but I'll report back on this issue once I've addressed the tasks in #59875.