Remove snippet csv support

[pokey]

Is there a reason we're keeping the snippet csv support around? From what I can tell everything else has been removed. See eg

cursorless/cursorless-talon/src/spoken_forms.json

Lines 236 to 257 in be953a5

	"experimental/wrapper_snippets.csv": {
	"wrapper_snippet": {
	"else": "ifElseStatement.alternative",
	"funk": "functionDeclaration.body",
	"if else": "ifElseStatement.consequence",
	"if": "ifStatement.consequence",
	"try": "tryCatchStatement.body",
	"link": "link.text"
	}
	},
	"experimental/insertion_snippets.csv": {
	"insertion_snippet_no_phrase": {
	"if": "ifStatement",
	"if else": "ifElseStatement",
	"try": "tryCatchStatement"
	}
	},
	"experimental/insertion_snippets_single_phrase.csv": {
	"insertion_snippet_single_phrase": {
	"funk": "functionDeclaration.name",
	"link": "link.text"
	}

Without it being removed, the files keep coming back after I deleted them

[AndreasArvidsson]

We still need to read from these lists for the migration, but maybe we can remove them from the spoken form json?

edit: I tried it and removing these lines throws an error that breaks Cursorless. See pr #2842