feat(go): support build tags configuration for test runs

[piraz]

Summary

Allow users to configure Go build tags globally via the chase setup() call.

Motivation

Some projects require build tags to run specific tests (e.g. integration, e2e). Without this, users must manually modify the chaser or run tests outside of chase.

Proposed Change

Add build_tags field to the Go chaser config:

require('chase').setup({
  chasers = {
    go = {
      build_tags = { 'integration', 'e2e' },
    }
  }
})

When build_tags is non-empty, inject -tags tag1,tag2 into the test command:

go test -v -tags integration,e2e ./... -run='...'