Allow trailing commas for tuple and array literals and update formatter to put them

[timotheeguerin]

fix #2284

Two changes:

• Allow parsing of trailing commas for tuple and array values
• Formatter Change Make the formatter put some when there is multiple lines involved: This is consitent with other formatting where we add the trailing separator(It is also the default for example for js/ts formatter)

[azure-sdk]

All changed packages have been documented.

• ✅ @typespec/compiler

Show changes

@typespec/compiler - feature ✏️

Allow trailing commas for tuple and array literals

@typespec/compiler - breaking ✏️

Formatter will add trailing commas for multi line tuples and array values

[azure-sdk]

You can try these changes here

🛝 Playground	🌐 Website	📚 Next docs

[timotheeguerin]

there is also another issue that just says to do that for all list, so wondering if I should split this into 2 prs.

1. remove the resitriction (allow parsing trailing separator for all lists)
   2.update formatter.

[timotheeguerin]

move the restrition removal to another PR and we can keep this one for the formatting change #4837

[microsoft-github-policy-service]

Hi @timotheeguerin. Your PR has had no update for 30 days and it is marked as a stale PR. If it is not updated within 30 days, the PR will automatically be closed. If you want to refresh the PR, please remove the stale label.

[microsoft-github-policy-service]

Hi @timotheeguerin. Your PR has had no update for 30 days and it is marked as a stale PR. If it is not updated within 30 days, the PR will automatically be closed. If you want to refresh the PR, please remove the stale label.