fix: nestjs

[ismoiliy98]

• Fixes nest js implementation
• Adds fastify adapter implementation for nest js
• Fixes bench.ts script where the header is set incorrectly in the commands array.
  Details

  When you split the command string by spaces (command.split(' ')), a shell does not interpret the single quotes. Instead, they are passed literally as part of the argument. Bombardier receives the header as 'content-type:application/json' (including the quotes), which is not a valid Content-Type header. This caused a problem with Fastify when I ran the benchmark on it. Fastify defaults to the application/octet-stream content type, throwing errors because there are no handlers for the application/octet-stream media type set by default in the nest js fastify adapter.