Interactive snapshot testing review

**Is your feature request related to a problem? Please describe.**

Is it possible to review snapshots interactively? Both `jest` and Rust `insta` support this feature.

**Describe the solution you'd like**

Add a new `--interactive` flag to snapshot testing.
When the interactive flag is specified, write the new snapshot to a `.snap.new` file and spawn a TUI to let the users review it interactively.

This review interface maybe be provided as a function to be run in `Deno.test.afterEach` or `Deno.test.afterAll` hooks, so that users can use their own functions and have integration with editors like VSCode and NeoVim.

**Describe alternatives you've considered**