Add into iter for decimal array

[liukun4515]

Is your feature request related to a problem or challenge? Please describe what you are trying to do.
In some cases #1073 (comment) , we need iter the decimal array, but the method of the accessor is below

We need to use the loop/for the method to iter the decimal array.

We need to implement the into iter for the decimal array

Describe the solution you'd like
A clear and concise description of what you want to happen.

Describe alternatives you've considered
A clear and concise description of any alternative solutions or features you've considered.

Additional context
Add any other context or screenshots about the feature request here.

[alamb]

I took a crack at this one in #1223