Allow syncing csv files as text module scripts

[fewkz]

csv is a very useful file format, there's lots of tools/extensions for editing csv files, which would make them great for storing item data for games with lots of item metadata. We should be able to sync csv files as a module script that return a string, similar to .txt files.
Syncing csv files as LocalizationTable should require a specific extension, like test.l10n.csv, or there should be an option similar to emitLegacyScripts which lets you choose whether csv files are treated as LocalizationTable.

They can just get synced as

return [[
name,description
item 1, this is the description
item 2, this is the second description
item 3, this is the third description
]]

There is also the possibility that we should be able to sync any file as a text module via some sort of field in the project format, like "syncAsText": true, so you could even sync other file types such as:

• .lua, .luau, maybe for loadstring? not that it's a good idea
• .json, .toml , maybe you don't want it to be parsed automatically
• other formats like .yaml, .jsonc, we could just implement our own parser in our game's code

[fewkz]

Guess this is possible via #813 by having a sync rule that makes csv files use text
I haven't been able to test if it works yet