Add Auto Reshim, closes #131

[marcell-vida]

Issue

Since #152 added support for consistent GOBIN usage, a manual asdf reshim golang command was required after installing Go packages using go install or go get.

A related issue: #131

Changes

This PR adds an automatic reshimming feature similar to implementations in asdf-python and asdf-nodejs. The go command is wrapped to automatically call asdf reshim golang after go install and legacy go get commands, eliminating the need for manual reshimming.

Additional features:

• Option to skip reshimming with ASDF_GOLANG_SKIP_RESHIM=1 environment variable
• Custom Go path configuration via ASDF_GOLANG_CANON_GO_PATH environment variable

---

Note: I’ll be away next week. Thanks to @ofalvai for reviewing this PR; he will handle all follow‑ups, with @pgyula as a backup.