Pass dimensions to 'serialize'.

[1uc]

By passing the dimensions to serialize allows serializing nested pointers. This was previously not possible because, we didn't know how many elements the pointer pointed to.

The logic for obtaining the dimensions of the array is:

• When creating/opening the array the memspace is set to be the same as the filespace.

• Performing a selection either leads to a simple (packed) multi-dimensional memspace; or to a one-dimensional memspace.

Therefore, if we perform a write without selection, we know the dimensions the input array must have. If we perform a selection we again know the dimensions the input buffer needs to have.

[1uc]

Since it changes the inspector, we should probably not merge this into v2.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (f32d186) 84.55% compared to head (c28af89) 84.55%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #939 +/- ## ======================================= Coverage 84.55% 84.55% ======================================= Files 86 86 Lines 5220 5220 ======================================= Hits 4414 4414 Misses 806 806 ```

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