Relay Resolver has module resolution problem in TypeScript

[chriserickson]

Same issue as #3989, but it was not completely fixed.

The dynamic imports in the AST omit extensions, however the type imports still have the extensions.

It appears that

relay/compiler/crates/relay-typegen/src/typescript.rs

Line 97 in 639abe1

fn write_import_module_default(&mut self, name: &str, from: &str) -> FmtResult {

and

relay/compiler/crates/relay-typegen/src/typescript.rs

Line 101 in 639abe1

fn write_import_type(&mut self, types: &[&str], from: &str) -> FmtResult {

Both also need to strip extensions, as typescript requires that extensions not be provided.