Add support for `flags` parameter of `redis.register_function`

[i18nsite]

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https://redis.io/docs/interact/programmability/functions-intro/#function-flags

Motivation

compatibility

Solution

No response

Are you willing to submit a PR?

• [ ] I'm willing to submit a PR!

[VasuDevrani]

@PragmaTwice

• flags parameter in redis.register_function
• will allow no-writes flag
• do we need to support other flags? like allow-oom, admin

Possible implementation:

1. RedisRegisterFunction parses flags table and checks for no-writes src/storage/scripting.cc
2. if invalid flag, raise error, else store as constant (or something else)
3. check function flags before execution FunctionCall src/storage/scripting.cc

if (read_only && !(flags & redis::kFunctionNoWrites)) {
  return {Status::NotOK, "Can not execute a function with write flag using fcall_ro."};
}