Dev Tools: Source map decoder

[barnjamin]

The VLQ encoding is a lot to ask folks to implement themselves, lets provide some easier way to get the numeric pc

Lifted from @algochoi https://github.com/algochoi/teal-sourcemap-decoder

@michaeldiamant I think this would need to be implemented across the SDKs assuming we can come up with a good way to expose it.

I'm imagining with the json src_map

err_pc_num = 996 # really comes from error message returned by algod
sm = SourceMap(src_map)
print(f"Teal source line number: {sm.get_line_for_pc(err_pc_num)}")

[algochoi]

Nice, I think this will work nicely when the APIs also support the disassemble endpoint (related ticket). We could add some cucumber tests in the testing repo as well to check the translation, but I'm not sure what would be the easiest way to test it (maybe output the VLQ->Int mapping in a unified JSON format?)

[ahangsu]

looking good, once Andrew's suggestion is resolved, we should probably ship it?

[michaeldiamant]

@barnjamin Leaving approval with a friendly reminder to revert branch change in run_integration.sh prior to merging.