[BUG] router.APIContainer.RegisterDependency only works with specific registration sequence

[yz89122]

Describe the bug router.APIContainer.RegisterDependency only works with specific registration sequence.

To Reproduce

1. In main.go

   package main
   
   import (
       "github.com/kataras/iris/v12"
   )
   
   func main() {
       app := iris.Default()
       app.ConfigureContainer(func(api *iris.APIContainer) {
   	    api.RegisterDependency(func(f32 float32) float64 {
   		    return float64(f32)
   	    })
   	    api.RegisterDependency(float32(1))
       })
   }
   

2. run with go run main.go

3. panic

   [DBUG] 2021/07/22 21:57 Log level set to "debug"
   [DBUG] 2021/07/22 21:57 Using <./access.log> to log requests
   [DBUG] 2021/07/22 21:57 Using <UUID4> to identify requests
   panic: expected [1] bindings (input parameters) but got [0]
   Function:
     - main.main.func1.1
   Expected:
     - [1] float32
   Missing:
     - [1] float32
   
   goroutine 1 [running]:
   github.com/kataras/iris/v12/hero.getBindingsForFunc(0x18a8380, 0x1a247d0, 0x13, 0xc000293a40, 0xc, 0xc, 0x1b29b00, 0xffffffffffffffff, 0x19b9f60, 0x1892e00, ...)
           /Users/yz/go/pkg/mod/github.com/kataras/iris/[email protected]/hero/binding.go:274 +0x785
   github.com/kataras/iris/v12/hero.fromDependentFunc(0x18a8380, 0x1a247d0, 0x13, 0xc000293b00, 0xc000293b00, 0xc000293a40, 0xc, 0xc, 0xc000293b00)
           /Users/yz/go/pkg/mod/github.com/kataras/iris/[email protected]/hero/dependency.go:214 +0x112
   github.com/kataras/iris/v12/hero.resolveDependency(0x18a8380, 0x1a247d0, 0x13, 0xc0002d1600, 0xc000293b00, 0xc000293a40, 0xc, 0xc, 0x1)
           /Users/yz/go/pkg/mod/github.com/kataras/iris/[email protected]/hero/dependency.go:91 +0xdf
   github.com/kataras/iris/v12/hero.newDependency(0x18a8380, 0x1a247d0, 0xc00029ee00, 0xc000293a40, 0xc, 0xc, 0x1823387)
           /Users/yz/go/pkg/mod/github.com/kataras/iris/[email protected]/hero/dependency.go:77 +0x1dc
   github.com/kataras/iris/v12/hero.(*Container).Register(0xc0004adc70, 0x18a8380, 0x1a247d0, 0xc000291190)
           /Users/yz/go/pkg/mod/github.com/kataras/iris/[email protected]/hero/container.go:284 +0x6a
   github.com/kataras/iris/v12/core/router.(*APIContainer).RegisterDependency(...)
           /Users/yz/go/pkg/mod/github.com/kataras/iris/[email protected]/core/router/api_container.go:71
   main.main.func1(0xc000273338)
           /Users/yz/workspace/test/main.go:10 +0x47
   github.com/kataras/iris/v12/core/router.(*APIBuilder).ConfigureContainer(0xc000279e60, 0xc0004c3f70, 0x1, 0x1, 0xffffffff)
           /Users/yz/go/pkg/mod/github.com/kataras/iris/[email protected]/core/router/api_builder.go:335 +0x64
   main.main()
           /Users/yz/workspace/test/main.go:9 +0x66
   exit status 2
   

Expected behavior No panic like

package main

import (
	"github.com/kataras/iris/v12"
)

func main() {
	app := iris.Default()
	app.ConfigureContainer(func(api *iris.APIContainer) {
		api.RegisterDependency(float32(1))
		api.RegisterDependency(func(f32 float32) float64 {
			return float64(f32)
		})
	})
}

Desktop (please complete the following information):

• OS: macOS Bug Sur 11.4
• go: 1.16

iris.Version

• v12.2.0-alpha2

[yz89122]

This behavior might make the API not easy to use since the user needs to register them in a specific sequence. Maybe we can make a API like container.Build() to build the dependency tree after all dependencies has been registered and before the app started.