Move block and method args to their own methods

[dpeacock]

The DAP server doesn't use args and in some instances retrieving these is very slow. Extracted them into their own methods to prevent this form slowing down DAP requests as the data is not used.

• Relates to Slow backtraces due to inspect of large local variables #635

[st0012]

@dpeacock I don't think it fixes #635. It just excludes DAP users from the problem. But console users will still face it as far as I understand?

[dpeacock]

@dpeacock I don't think it fixes #635. It just excludes DAP users from the problem. But console users will still face it as far as I understand?

Good call-out it just prevents the issue from happening for DAP clients. Console users will experience it, but at least can specific the depth of the stacktrace from the commandline which the DAP clients currently cannot do.

[st0012]

@dpeacock Thanks for the PR 🎉
@ko1 I think this one looks good and can be merged.

[st0012]

@peterzhu2118 Could you give this a look? Thx

[peterzhu2118]

Looks good, thank you!