…alarzm)

This PR was merged into the 4.4 branch.

Discussion
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[Serializer][CSV] Add context options to handle BOM

| Q             | A
| ------------- | ---
| Branch?       | 4.4
| Bug fix?      | no
| New feature?  | yes
| Deprecations? | no
| Tickets       | Fix #33684
| License       | MIT
| Doc PR        | symfony/symfony-docs#12461

This allows BOM handling in en/decoded CSV files. To keep current behaviour intact both skipping BOM at the beginning of the CSV and outputting BOM are an opt-in feature.

Personally I'd propose to make `SKIP_INPUT_BOM` default to `false` in 5.0 so the BOM is transparent and people that for some reasons expect BOM characters to be present in the parsed text explicitly opt-out of trimming it.

Commits
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3eb3668 Add context options to handle BOM