feat: devenv exec

[joshuarli]

this'll be useful in running stuff in devenv's environment if user's environment is broken

[sentry-io]

🔍 Existing Issues For Review

Your pull request is modifying functions with the following pre-existing issues:

📄 File: devenv/main.py

Function	Unhandled Issue
devenv	RuntimeError: Command devenv sync failed! (code 1) devenv.lib.proc in... Event Count: 65
devenv	RuntimeError: Command make bootstrap failed! (code 2) devenv.lib.proc... Event Count: 48
devenv	RuntimeError: [Errno 2] No such file or directory: '/opt/homebrew/bin/brew' ... Event Count: 23
devenv	RuntimeError: Command git -C /home/nketiah/Desktop/Opensource/Sentry/sentry rev-parse --show-cdup failed! (co... ... Event Count: 10
devenv	RuntimeError: Command /Users/evan/Coding/sentry/.venv/bin/sentry init --dev failed! (code 1) ... Event Count: 3

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