Add containerName to CallHierarchyItem

[andrewbranch]

Adds a containerName to CallHierarchyItems:

• For class methods and accessors (static or instance), uses the class declaration/expression’s name (if it exists)
• For object literal methods and accessors, uses the assigned name of the object literal (if it exists)
• For top-level function- and class-like declarations in a module declaration, uses the module name (if it is an identifier)

For all other CallHierarchyItems, containerName will be undefined. Note that fileName is already included separately on all items.

Fixes #37061