[Expressions] Debug mode

[streamich]

Add ability to execute expression in a "debug" mode, which would collect execution information about each function, which would be used in Expression Explorer (developed by Canvas) as well as in Canvas app when expression editor is open.

• Add ability to execute expression in "debug" mode.
• For each function should collect:
  • Input;
  • Output;
  • Arguments and info about sub-expressions, if any;
  • Reference to ExpressionFunctionDefinition;
  • Time it took to execute the function;
• Debug information could be collected on:
  • An "execution chain"—a linked list of execution chain is created with debug information about every function as they execute. Note: this chain will contain information only until the first function that throws (because once one function throws expression executor stops execution).
  • Store debug information on the AST used to execute the function.
  • Create a new AST as expression executes.

Related:

• Clint's PoC
• Progress gauging #51245

Parent issue: #46909

[elasticmachine]

Pinging @elastic/kibana-app-arch (Team:AppArch)

[elasticmachine]

Pinging @elastic/kibana-canvas (Team:Canvas)