[Bug Report] Parsing column prop with dots or barckets imperfectly

### Element UI version
2.15.10

### OS/Browsers version
Windows 10 / Chrome 105.0.5195.127

### Vue version
2.7.10

### Reproduction Link
https://codepen.io/i33558493/pen/PoeQgdw

### Steps to reproduce
1. Create a el-table component.
2. Set the column prop like 'a.b' or 'a[b]'.
3. Make some table data wtih a property name like 'a.b' or 'a[b]'.

### What is Expected?
Show the 'a.b' column.

### What is actually happening?
Data of 'a.b' column do not show.