feat: init API system with new crate metassr-api-handler

[fahdfady]

resolves #25

[hulxv]

if we have multiple endpoints, the handler names will be duplicated (GET, POST, etc..). I think that will make metacall panics because it doesn't accept duplicated names

CC: @viferga

[fahdfady]

@hulxv Yeah you're right. that's a problem i encountered in my demo and @viferga helped me solve this.
I'll make a HashMap of <Path, Handle> so each file has it's own handle in a scope.
Thanks Mohamed.

[hulxv]

Dont miss resolving conflicts

[hulxv]

it seems you have an error

 error[E0061]: this function takes 3 arguments but 2 arguments were supplied
   --> crates/metassr-bundler/src/lib.rs:103:29
    |
103 |             if let Err(e) = load::from_memory(load::Tag::NodeJS, BUILD_SCRIPT) {
    |                             ^^^^^^^^^^^^^^^^^--------------------------------- argument #3 of type `std::option::Option<&mut metacall::load::Handle>` is missing
    |
note: function defined here
   --> /home/runner/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/metacall-0.5.6/src/load.rs:172:8
    |
172 | pub fn from_memory(
    |        ^^^^^^^^^^^
help: provide the argument
    |
103 |             if let Err(e) = load::from_memory(load::Tag::NodeJS, BUILD_SCRIPT, /* std::option::Option<&mut metacall::load::Handle> */) {
    |            

[fahdfady]

it seems you have an error

Yeah my bad that was because of the conflicts. It should work now

[hulxv]

What's the current status? Does it work as expected?