Column headers with the non unique names are replacing each other

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* Operating System: Windows
* Node Version: v16.15.0
* NPM Version: 8.5.5
* csv-parser Version: I'm using neat-csv version 7.0.0

### Expected Behavior
```
const csv = 'type,part,part\nunicorn,horn,eye\nrainbow,pink,tail';

console.log(await neatCsv(csv)); // [{type: 'unicorn', part: 'horn', part_1: 'eye'}, {type: 'rainbow', part: 'pink', part: 'tail'}]
```

When importing a CSV file with non unique header names into Excel it will add `_#`. In this example it will create the following headers: `type | part | part_1`

### Actual Behavior
```
const csv = 'type,part,part\nunicorn,horn,eye\nrainbow,pink,tail';

console.log(await neatCsv(csv)); // [{type: 'unicorn', part: 'eye'}, {type: 'rainbow', part: 'tail'}]
```

It looks like it overrides the previous column with the same header name.

### How Do We Reproduce?
Use the examples from above or see this sandbox
https://codesandbox.io/s/read-file-node-ejs-forked-pqmqrm?file=/src/index.js

Start with the duplicate-header CSV examples in the issue and compare the current output with the expected part and part_1 fields. Use the linked CodeSandbox to reproduce the behavior; done means repeated headers are preserved with suffixed names and all row values remain available.

Written by the indexing model from the issue text.