Deprecate the nu_scripts version of stdlib-candidate (#1042)

Deprecates the existing `stdlib-candidate` directories in `nu_scripts`
since `std-rfc` has now transitioned to the main repo. Updates readme
and renamed directories.

stdlib-candidate-archive/stdlib-candidate-older/std-rfc/record/mod.nu

@@ -0,0 +1,46 @@
+# Merge a list of records
+export def "list merge" []: list<record> -> record {
+    let list = $in
+    mut result = {}
+    for $obj in $list {
+        $result = ($result | merge $obj)
+    }
+    $result
+}
+
+# Filter fields name by predicate
+export def "filter-name predicate" [
+    pred: closure  # Predicate closure that checks fields name
+]: record -> record {
+    let $obj_input = $in
+    $obj_input
+        | columns
+        | where { $in | do $pred }
+        | each {|input|
+            { $input: ($obj_input | get $input) }
+        }
+        | list merge
+}
+
+# Filter fields name by text checking
+export def "filter-name text" [
+    filter: string  # Text to match with
+    --regex(-r)     # Match by regex
+]: record -> record {
+    let obj = $in
+    $obj | filter-name predicate { not ($in | (if $regex {find -r $filter} else {find $filter})  | is-empty) }
+}
+
+# Filter fields value by predicate
+export def "filter-value predicate" [
+    pred: closure # Predicate closure that checks fields value
+]: record -> record {
+    let $obj_input = $in
+    $obj_input
+        | columns
+        | where {|col| $obj_input | get $col | do $pred }
+        | each {|input|
+            { $input: ($obj_input | get $input) }
+        }
+        | list merge
+}