Chore: Add witness hint for enum_tuple_variant_field_added lint (#1212)

Adds a witness hint for the `enum_tuple_variant_field_added` lint.

## Example
`enum_tuple_variant_field_added` outputs the following witness hint for
the `./test_crates/enum_tuple_variant_field_added/` test.
```rust
match value {
    enum_tuple_variant_field_added::PublicEnum::TupleVariantWithFieldAdded (_, _) => (),
    _ => (),
}
```
This compiles on the old version, but not on the new due to the lack of
exhaustiveness in the destructuring of the enum variant.

## Commit Notes
+ Added witness hint for enum_tuple_variant_field_added
+ Added new query for baseline_field_names for extra witness data

## Comments
It took a little bit to figure out what would be the best way to execute
this in the handlebars template. Settled on an `#each` iterating over
the baseline fields, though the indices are discarded and just replaced
with underscores. There's also an `#unless @last` to only join with the
commas, rather than always placing it after.

Author: GlitchlessCode

src/lints/enum_tuple_variant_field_added.ron

@@ -69,6 +69,8 @@ SemverQuery(
                                 field @fold @transform(op: "count") @filter(op: "=", value: ["$zero"]) {
                                     name @filter(op: "=", value: ["%field_name"])
                                 }
+                                
+                                field @fold @transform(op: "count") @output(name: "field_count")
                             }
                         }
                     }
@@ -84,4 +86,10 @@ SemverQuery(
     },
     error_message: "An enum's exhaustive tuple variant has a new field, which has to be included when constructing or matching on this variant.",
     per_result_error_template: Some("field {{field_name}} of variant {{enum_name}}::{{variant_name}} in {{span_filename}}:{{span_begin_line}}"),
+    witness: (
+        hint_template: r#"match value {
+    {{ join "::" path }}::{{ variant_name }} ({{#repeat field_count }}_{{#unless @last}}, {{/unless}}{{/repeat}}) => (),
+    _ => (),
+}"#, 
+    ),
 )

test_outputs/query_execution/enum_tuple_variant_field_added.snap

@@ -7,6 +7,7 @@ snapshot_kind: text
   "./test_crates/enum_struct_field_hidden_from_public_api/": [
     {
       "enum_name": String("AddedVariantField"),
+      "field_count": Uint64(1),
       "field_name": String("1"),
       "path": List([
         String("enum_struct_field_hidden_from_public_api"),
@@ -21,6 +22,7 @@ snapshot_kind: text
   "./test_crates/enum_tuple_variant_field_added/": [
     {
       "enum_name": String("PublicEnum"),
+      "field_count": Uint64(2),
       "field_name": String("2"),
       "path": List([
         String("enum_tuple_variant_field_added"),

test_outputs/witnesses/enum_tuple_variant_field_added.snap

@@ -0,0 +1,23 @@
+---
+source: src/query.rs
+description: "Lint `enum_tuple_variant_field_added` did not have the expected witness output.\nSee https://github.com/obi1kenobi/cargo-semver-checks/blob/main/CONTRIBUTING.md#testing-witnesses\nfor more information."
+expression: "&actual_witnesses"
+snapshot_kind: text
+---
+[["./test_crates/enum_struct_field_hidden_from_public_api/"]]
+filename = 'src/lib.rs'
+begin_line = 43
+hint = '''
+match value {
+    enum_struct_field_hidden_from_public_api::AddedVariantField::TupleVariant (_) => (),
+    _ => (),
+}'''
+
+[["./test_crates/enum_tuple_variant_field_added/"]]
+filename = 'src/lib.rs'
+begin_line = 5
+hint = '''
+match value {
+    enum_tuple_variant_field_added::PublicEnum::TupleVariantWithFieldAdded (_, _) => (),
+    _ => (),
+}'''