roachprod: add chaos CLI for failure injection

This commit introduces the `roachprod chaos` command tree, providing
CLI support for the failure injection library to test cluster resilience
under various failure scenarios.

Changes:
- Add `chaos` root command with global flags for controlling failure
  duration and cleanup behavior
- Implement network failure commands:
- `chaos network partition bidirectional`: complete network splits
- `chaos network partition asymmetric`: directional traffic dropping
- `chaos network latency`: artificial network delay injection

Example usage:
  roachprod chaos network partition asymmetric mycluster \
    --src 1,2 --dest 3,4 --direction incoming \
    --wait-before-cleanup 10m

Epic: none

Release note: None

Author: shailendra-patel

pkg/cmd/roachprod/cli/BUILD.bazel

@@ -4,6 +4,8 @@ go_library(
     name = "cli",
     srcs = [
         "bash_completion.go",
+        "chaos.go",
+        "chaos_network.go",
         "commands.go",
         "flags.go",
         "handlers.go",
@@ -22,7 +24,9 @@ go_library(
         "//pkg/roachprod/cloud",
         "//pkg/roachprod/config",
         "//pkg/roachprod/errors",
+        "//pkg/roachprod/failureinjection/failures",
         "//pkg/roachprod/install",
+        "//pkg/roachprod/logger",
         "//pkg/roachprod/roachprodutil",
         "//pkg/roachprod/ssh",
         "//pkg/roachprod/ui",