Fix github #167.
* indium-client.el (indium-client-evaluate): Add a FRAME parameter to
specify which context to evaluate an expression in.
* indium-debugger.el (indium-debugger-evaluate): Add an optional FRAME
parameter that is the current frame by default.
* indium-interaction.el (indium-eval): Use the current debugger frame
to evaluate the passed expression.
* indium-repl.el (indium-repl-inspect): (indium-repl-evaluate): Use
the current debugger frame to inspect and evaluate expressions.
* server/README.md: Describe the frameId parameter that the server now
accepts for evaluation.
* server/adapters/cdp/index.js (evaluate): Accept an optional frameId
parameter.
* server/server/runtime.js (evaluate): Accept an optional frameId
parameter.