Add IFRT C-API bindings (EnzymeAD#178)

* Init prototype of IFRT C-API

* Add some C-API for `Executable`, `LoadedExecutable`

* Add C-API for `DynamicShape`

* Add C-API bindings to `Index`, `IndexDomain`

* small fixes

* small changes

* Add C-API for `Compiler`

* Add C-API for `MemoryKind`

* more implementations

* Refactor `#pragma region`s

* more methods

* more c methods

* more methods

* more stuff

* more changes

* more changes to `ifrt::Array`

* Fix PJRT-backed IFRT-backend lib dependency

* fixes

* fixes

* small fix

* disable functions who need `shared_ptr`

* fix return type of `ifrt_compiler_compile_with_topology`

* comment `ifrt_hloprogram_ctor_with_context_and_module` due to problems with `MLIRContext` constructor

* fix `tsl::RCReference<ifrt::Value>` construction

* Update deps/ReactantExtra/API.cpp

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Co-authored-by: Sergio Sánchez Ramírez <[email protected]>

Author: mofeing