Add exception handling in AGAS namespace server iterate methods

[GitMasterJatin]

There are TODO comments indicating missing exception handling in the AGAS base namespace servers:

1. libs/full/agas_base/src/server/component_namespace_server.cpp (line 281)
2. libs/full/agas_base/src/server/symbol_namespace_server.cpp (line 279)

// TODO: catch exceptions
void component_namespace::iterate_types(
iterate_types_function_type const& f)
{
// ... implementation without try-catch
}

Suggested Fix
Wrap the iteration logic in appropriate try-catch blocks to handle potential exceptions gracefully, following HPX's error handling patterns

[GitMasterJatin]

Please assign me this issue

[hkaiser]

@GitMasterJatin How do you suggest we should change the implementation? Currently, any exceptions thrown from this code bubble up to the user, where it can be handled. What would be different if you added some exception handling inside those functions?