Support FORCE keyword in OPTIMIZE TABLE statement

FORCE is equivalent to FINAL in OPTIMIZE TABLE statements - both force
a merge. Add parsing support for FORCE to set the Final flag.

Fixes test: 03306_optimize_table_force_keyword/stmt4

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: kyleconroy

parser/parser.go

@@ -6752,8 +6752,8 @@ func (p *Parser) parseOptimize() *ast.OptimizeQuery {
 		opt.Partition = p.parseExpression(LOWEST)
 	}
 
-	// Handle FINAL
-	if p.currentIs(token.FINAL) {
+	// Handle FINAL or FORCE (both are equivalent for forcing merge)
+	if p.currentIs(token.FINAL) || (p.currentIs(token.IDENT) && strings.ToUpper(p.current.Value) == "FORCE") {
 		opt.Final = true
 		p.nextToken()
 	}

parser/testdata/03306_optimize_table_force_keyword/metadata.json

@@ -1,5 +1 @@
-{
-  "explain_todo": {
-    "stmt4": true
-  }
-}
+{}