TS: fix sourceName in table schema (#4449)

# Description of Changes
fixes: #4433.
Test will be added in:
https://github.com/clockworklabs/SpacetimeDB/pull/4450/changes

# API and ABI breaking changes
NA

# Expected complexity level and risk
2

Author: Shubham8287

crates/bindings-typescript/src/lib/schema.ts

@@ -91,7 +91,10 @@ export function tableToSchema<
 
   type AllowedCol = keyof T['rowType']['row'] & string;
   return {
-    sourceName: accName,
+    // For client,`schama.tableName` will always be there as canonical name.
+    // For module, if explicit name is not provided via `name`, accessor name will
+    // be used, it is stored as alias in database, hence works in query builder.
+    sourceName: schema.tableName || accName,
     accessorName: accName,
     columns: schema.rowType.row, // typed as T[i]['rowType']['row'] under TablesToSchema<T>
     rowType: schema.rowSpacetimeType,

crates/codegen/src/rust.rs

@@ -671,7 +671,7 @@ pub struct {cols_struct} {{"
     )?;
 
     for element in &product_def.elements {
-        let field_name = &element.0;
+        let field_name = &element.0.deref().to_case(Case::Snake);
         let field_type = type_name(module, &element.1);
         writeln!(
             out,
@@ -690,7 +690,7 @@ impl __sdk::__query_builder::HasCols for {struct_name} {{
         {cols_struct} {{"
     )?;
     for element in &product_def.elements {
-        let field_name = &element.0;
+        let field_name = &element.0.deref().to_case(Case::Snake);
         writeln!(
             out,
             "            {field_name}: __sdk::__query_builder::Col::new(table_name, {field_name:?}),"