lib(wasmer): Create wrapper around wasmer.Memory

[jimjbrettj]

Issue summary

• Create a thin wrapper around Wasmer memory to support the gossamer runtime.Memory interface
• This is needed for lib(wasmer): Upgade wasmer to newest version #3136

Other information and links

• See this issue from old PR as reference:

  gossamer/lib/runtime/wasmer/memory.go

  Line 29 in fff8cb0

  type Memory struct {

[jimjbrettj]

Closed by #3160