Add ideas for more Wasm APIs

ideas/apis.txt

@@ -0,0 +1,74 @@
+Ideas for events and control APIs
+
+Wasm Events	 	arguments
+------------------------------------------
+alloc struct/array instance
+read/write access
+  - memory location
+  - table element
+  - global
+  - object
+  - field
+frame unwind
+throw exception
+catch exception
+trap
+
+Sub-wasm Events
+-------------------------------------------
+single-step
+gc:start/end
+object freed
+binding between module
+lock acquire/release
+thread switch
+thread block
+thread resume
+compile function
+deopt function
+OSR frame
+insert/remove probe
+load module
+validation error
+linking error
+OS-level signal
+I/O to files, sockets
+
+Command/APIs
+------------------------------------------
+load wasm module
+create new instance, memory, memory, global, table, funcref
+insert probe on event
+remove probe on event
+compile/deopt function
+tune parameters
+  - GC heuristics
+  - compiler heuristics
+  - interpreter heuristics
+
+APIs
+------------------------------------------
+frame accessor
+  - get/set local
+  - get/set operand
+  - get pc, func, instance
+  - get depth
+  - get caller
+lock
+  - get owner
+mirror on
+  - module
+  - instance
+  - memory
+  - global
+  - table
+  - funcref
+redefine
+  - function
+  - module
+list loaded modules
+list instances
+list threads
+get resource usage
+deliver signal/async event
+dump core