feat(lsp): add textDocument/rangeFormatting support

Advertise DocumentRangeFormattingProvider in server capabilities and
implement rangeFormat: formats the complete document, then returns an
edit covering only the minimal changed-line region that overlaps the
client's selection. Also includes gofmt alignment fixes across lint
and format packages.

pkg/lint/rules_correctness.go

@@ -14,7 +14,7 @@ import (
 // break callers silently. Enumerate the columns you need explicitly.
 type ruleCOR001 struct{}
 
-func (ruleCOR001) ID() string                    { return "COR001" }
+func (ruleCOR001) ID() string                     { return "COR001" }
 func (ruleCOR001) Severity() diagnostics.Severity { return diagnostics.SeverityHint }
 
 func (ruleCOR001) Check(stmts []*pg_query.RawStmt, src string) []diagnostics.Diagnostic {
@@ -71,7 +71,7 @@ func checkSelectStmt(s *pg_query.SelectStmt, src string, out *[]diagnostics.Diag
 // An UPDATE with no WHERE clause modifies every row in the table.
 type ruleCOR002 struct{}
 
-func (ruleCOR002) ID() string                    { return "COR002" }
+func (ruleCOR002) ID() string                     { return "COR002" }
 func (ruleCOR002) Severity() diagnostics.Severity { return diagnostics.SeverityWarning }
 
 func (ruleCOR002) Check(stmts []*pg_query.RawStmt, src string) []diagnostics.Diagnostic {
@@ -101,7 +101,7 @@ func (ruleCOR002) Check(stmts []*pg_query.RawStmt, src string) []diagnostics.Dia
 // Use TRUNCATE if you intend a full wipe; it is faster and explicit.
 type ruleCOR003 struct{}
 
-func (ruleCOR003) ID() string                    { return "COR003" }
+func (ruleCOR003) ID() string                     { return "COR003" }
 func (ruleCOR003) Severity() diagnostics.Severity { return diagnostics.SeverityWarning }
 
 func (ruleCOR003) Check(stmts []*pg_query.RawStmt, src string) []diagnostics.Diagnostic {