execlastid doesn't respect `support_big_numbers`

[Yasuhiro SHIMIZU]

related: #13, #15

sqlc-gen-typescript/examples/node-mysql2/src/db/query_sql.ts

Lines 94 to 100 in 1a42ab0

 export async function createAuthorReturnId(client: Client, args: CreateAuthorReturnIdArgs): Promise<number> { 
     const [result] = await client.query<ResultSetHeader>({ 
         sql: createAuthorReturnIdQuery, 
         values: [args.name, args.bio] 
     }); 
     return result?.insertId ?? 0; 
 } 

This method should return string as support_big_numbers and big_number_strings is enabled in sqlc.dev.yml

sqlc-gen-typescript/examples/sqlc.dev.yaml

Lines 43 to 54 in 1a42ab0

 - schema: "authors/mysql/schema.sql" 
   queries: "authors/mysql/query.sql" 
   engine: "mysql" 
   codegen: 
   - plugin: ts 
     out: node-mysql2/src/db 
     options: 
       runtime: node 
       driver: mysql2 
       mysql2: 
         big_number_strings: true 
         support_big_numbers: true 

This is because I explicitly declared a return type as number here

https://github.com/sqlc-dev/sqlc-gen-typescript/pull/13/files#diff-2078b150759ca61c4ae2bb37cb070f5a2d81e64c7b4d1aa126f621e2520f13d0R641-R643

but should respect PK's type.

[Yasuhiro SHIMIZU]

@kyleconroy How can I find out PK's type?
I checked every value in GenerateRequest, but could not find one.

AFAIK, we can return Promise<string | number> from :execlastid, but it's not possible to define explicit type with current information.