vm: introduce new I_DYNLOAD opcode

The I_DYNLOAD opcode is basically a bytecode level instruction for
uc_require() with semantics similar to I_IMPORT. It allows loading
a dynamic extension library at runtime and treating values from the
resulting module context object like exports from a compile time source
module.

For example the statement `import { readfile, writefile } from "fs"`
would import the readfile() and writefile() functions of fs.so as
readonly live bindings into the current file scope.

Signed-off-by: Jo-Philipp Wich <jo@mein.io>

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