feat(cli): add forest-cli wait-api

[hanabi1224]

Summary of changes

This PR ports lotus wait-api to Forest

Changes introduced in this pull request:

• add forest-cli wait-api command

var WaitApiCmd = &cli.Command{
	Name:  "wait-api",
	Usage: "Wait for lotus api to come online",
	Flags: []cli.Flag{
		&cli.DurationFlag{
			Name:  "timeout",
			Usage: "duration to wait till fail",
			Value: time.Second * 30,
		},
	},
	Action: func(cctx *cli.Context) error {
		ctx := ReqContext(cctx)
		ctx, cancel := context.WithTimeout(ctx, cctx.Duration("timeout"))
		defer cancel()
		for {
			if ctx.Err() != nil {
				break
			}

			api, closer, err := GetAPI(cctx)
			if err != nil {
				fmt.Printf("Not online yet... (%s)\n", err)
				time.Sleep(time.Second)
				continue
			}
			defer closer()

			_, err = api.Version(ctx)
			if err != nil {
				return err
			}

			return nil
		}

		if ctx.Err() == context.DeadlineExceeded {
			return fmt.Errorf("timed out waiting for api to come online")
		}

		return ctx.Err()
	},
}

Reference issue to close (if applicable)

Closes #5248

Other information and links

Change checklist

• I have performed a self-review of my own code,
• I have made corresponding changes to the documentation. All new code adheres to the team's documentation standards,
• I have added tests that prove my fix is effective or that my feature works (if possible),
• I have made sure the CHANGELOG is up-to-date. All user-facing changes should be reflected in this document.

[hanabi1224]

Tested here: https://github.com/ChainSafe/forest/actions/runs/13235699771

[LesnyRumcajs]

It might make sense to specify the input type (some examples?). Reading the description I am not sure if I should type --timeout 30 or --timeout 30s or --timeout 0.5min without going deeper into the code.

[hanabi1224]

Fixed.

[LesnyRumcajs]

rock-solid