Improving Solargraph options (#16899)

I'm following the guidance of https://solargraph.org/guides/rails as
well as https://github.com/iftheshoefritz/solargraph-rails

The goal is to improve the [Language Server Protocol (LSP)][1] support
for Ruby in this repository.  For Emacs this means I get intellisense
type support (e.g. meaningful auto-completion based on symbols).  For
those using VSCode or Vim, there are Solargraph plugins available,
scroll to the [Supported Editors section of Solargraph's homepage][2].

[1]:https://microsoft.github.io/language-server-protocol/specifications/specification-current/
[2]:https://solargraph.org

.gitignore

@@ -103,3 +103,6 @@ dump.rdb
 
 # pry configuration file
 .pryrc
+
+# generated yarddoc
+doc/

.solargraph.yml

@@ -0,0 +1,23 @@
+---
+include:
+- "**/*.rb"
+exclude:
+- spec/**/*
+- test/**/*
+- vendor/**/*
+- ".bundle/**/*"
+require: []
+domains: []
+reporters:
+- rubocop
+- require_not_found
+formatter:
+  rubocop:
+    cops: safe
+    except: []
+    only: []
+    extra_args: []
+require_paths: []
+plugins:
+  - solargraph-rails
+max_files: 5000

Gemfile

@@ -125,7 +125,11 @@ group :development do
   gem "listen", "~> 3.7", require: false # Helps 'listen' to file system modifications events (also used by other gems like guard)
   gem "memory_profiler", "~> 1.0", require: false # Memory profiling routines for Ruby 2.3+
   gem "solargraph", "~> 0.44", require: false # For LSP support (such as symbol renaming, documentation lookup)
+  gem "solargraph-rails", "~> 0.3.1", require: false # For LSP support with Rails
   gem "web-console", "~> 4.2" # Rails Console on the Browser
+  gem "yard", "~> 0.9" # Documentation format
+  gem "yard-activerecord", "~> 0.0"
+  gem "yard-activesupport-concern", "~> 0.0"
 end
 
 group :development, :test do

Gemfile.lock

@@ -330,8 +330,6 @@ GEM
     globalid (1.0.0)
       activesupport (>= 5.0)
     google-protobuf (3.19.4)
-    google-protobuf (3.19.4-x86_64-darwin)
-    google-protobuf (3.19.4-x86_64-linux)
     guard (2.18.0)
       formatador (>= 0.2.4)
       listen (>= 2.7, < 4.0)
@@ -493,12 +491,6 @@ GEM
     nokogiri (1.13.3)
       mini_portile2 (~> 2.8.0)
       racc (~> 1.4)
-    nokogiri (1.13.3-arm64-darwin)
-      racc (~> 1.4)
-    nokogiri (1.13.3-x86_64-darwin)
-      racc (~> 1.4)
-    nokogiri (1.13.3-x86_64-linux)
-      racc (~> 1.4)
     notiffany (0.1.3)
       nenv (~> 0.1)
       shellany (~> 0.0)
@@ -793,6 +785,9 @@ GEM
       thor (~> 1.0)
       tilt (~> 2.0)
       yard (~> 0.9, >= 0.9.24)
+    solargraph-rails (0.3.1)
+      activesupport
+      solargraph (>= 0.41.1)
     sprockets (4.0.3)
       concurrent-ruby (~> 1.0)
       rack (> 1, < 3)
@@ -881,6 +876,10 @@ GEM
       nokogiri (~> 1.8)
     yard (0.9.27)
       webrick (~> 1.7.0)
+    yard-activerecord (0.0.16)
+      yard (>= 0.8.3)
+    yard-activesupport-concern (0.0.1)
+      yard (>= 0.8)
     zeitwerk (2.5.4)
     zonebie (0.6.1)
 
@@ -1018,6 +1017,7 @@ DEPENDENCIES
   simplecov (~> 0.21.2)
   slack-notifier (~> 2.4)
   solargraph (~> 0.44)
+  solargraph-rails (~> 0.3.1)
   sprockets (~> 4.0)
   staccato (~> 0.5)
   stackprof (~> 0.2)
@@ -1039,6 +1039,9 @@ DEPENDENCIES
   webmock (~> 3.14)
   webpacker (~> 5.4.3)
   with_model (~> 2.1.6)
+  yard (~> 0.9)
+  yard-activerecord (~> 0.0)
+  yard-activesupport-concern (~> 0.0)
   zonebie (~> 0.6.1)
 
 RUBY VERSION