To better distinguish the deno_core crate from the executable deno,
which will now be called "the cli" internally.

Instead use: tools/build.py --release

Re-enables arm64 CI test

Removing this reduces tail latency in test/http_bench.ts by half.

This disables a few tests which are broken still:
- tests/error_004_missing_module.test
- tests/error_005_missing_dynamic_import.test
- tests/error_006_import_ext_failure.test
- repl_test test_set_timeout
- repl_test test_async_op
- repl_test test_set_timeout_interlaced
- all of permission_prompt_test

We always pass around Box<[u8]>, and adding this generic is an
unnecessary complication.

Add deno_core_http_bench_test to test.py

sharedQueue works on deno_core_http_bench

Fixes #1787

This is in preperation for core integration.

* Privatize a few deno_core::Isolate methods
* Add deno_core::Isolate docs

* Replace Deno.OSType enum with Deno.OperatingSystem type alias

* Add arm64 to supported CPU architectures

* add type alias for cpu arch Deno.Arch

Move v8_set_flags and v8_version to core. (The idea is that src/ should
not depend on libdeno.rs anymore. This is a step towards that.)