Split `infer` query into two for better profiling

This is the same change as we did with `crate_def_map` and it does seem
that we mostly spend time in salsa, without recomputing much on
rust-analyzer side.

Example output:

```
 233ms - handle_inlay_hints
      163ms - get_inlay_hints
          163ms - SourceAnalyzer::new
               67ms - def_with_body_from_child_node
                   67ms - analyze_container
                       67ms - analyze_container
                           67ms - Module::from_definition
                               67ms - Module::from_file
                                   67ms - crate_def_map
                                        0ms - parse_macro_query (6 calls)
                                        0ms - raw_items_query (1 calls)
                                       66ms - ???
                            0ms - crate_def_map (1 calls)
                        0ms - crate_def_map (1 calls)
               96ms - infer
                    2ms - trait_solve_query (2 calls)
                   94ms - ???
                0ms - body_with_source_map_query (1 calls)
                0ms - crate_def_map (1 calls)
      [...]
```

Signed-off-by: Michal Terepeta <[email protected]>

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