runtime(thrift): add ftplugin, indent and syntax scripts

Problem: Apache Thrift files misses ftplugin, indent and syntax scripts

Solution:
- add ftplugin and indent scripts
- add thrift indent test
- port the syntax script from apache/thrift (Apache License 2)

Reference:
https://diwakergupta.github.io/thrift-missing-guide/#_language_reference

closes: #15387

Signed-off-by: Yinzuo Jiang <jiangyinzuo@foxmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>

runtime/syntax/thrift.vim

@@ -0,0 +1,74 @@
+" Vim syntax file
+" Language: Thrift
+" Original Author: Martin Smith <martin@facebook.com>
+" Maintainer: Yinzuo Jiang <jiangyinzuo@foxmail.com>
+" Last Change: 2024/07/29
+" https://github.com/apache/thrift/blob/master/contrib/thrift.vim
+"
+" Licensed to the Apache Software Foundation (ASF) under one
+" or more contributor license agreements. See the NOTICE file
+" distributed with this work for additional information
+" regarding copyright ownership. The ASF licenses this file
+" to you under the Apache License, Version 2.0 (the
+" "License"); you may not use this file except in compliance
+" with the License. You may obtain a copy of the License at
+"
+"   http://www.apache.org/licenses/LICENSE-2.0
+"
+" Unless required by applicable law or agreed to in writing,
+" software distributed under the License is distributed on an
+" "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+" KIND, either express or implied. See the License for the
+" specific language governing permissions and limitations
+" under the License.
+"
+
+if exists("b:current_syntax")
+  finish
+endif
+
+" Todo
+syn keyword thriftTodo TODO todo FIXME fixme XXX xxx contained
+
+" Comments
+syn match thriftComment "#.*" contains=thriftTodo
+syn region thriftComment start="/\*" end="\*/" contains=thriftTodo
+syn match thriftComment "//.\{-}\(?>\|$\)\@="
+
+" String
+syn region thriftStringDouble matchgroup=None start=+"+  end=+"+
+
+" Number
+syn match thriftNumber "-\=\<\d\+\>" contained
+
+" Keywords
+syn keyword thriftKeyword namespace
+syn keyword thriftKeyword xsd_all xsd_optional xsd_nillable xsd_attrs
+syn keyword thriftKeyword include cpp_include cpp_type const optional required
+syn keyword thriftBasicTypes void bool byte i8 i16 i32 i64 double string binary
+syn keyword thriftStructure map list set struct typedef exception enum throws union
+
+" Special
+syn match thriftSpecial "\d\+:"
+
+" Structure
+syn keyword thriftStructure service oneway extends
+"async"         { return tok_async;         }
+"exception"     { return tok_xception;      }
+"extends"       { return tok_extends;       }
+"throws"        { return tok_throws;        }
+"service"       { return tok_service;       }
+"enum"          { return tok_enum;          }
+"const"         { return tok_const;         }
+
+hi def link thriftComment Comment
+hi def link thriftKeyword Special
+hi def link thriftBasicTypes Type
+hi def link thriftStructure StorageClass
+hi def link thriftTodo Todo
+hi def link thriftString String
+hi def link thriftNumber Number
+hi def link thriftSpecial Special
+hi def link thriftStructure Structure
+
+let b:current_syntax = "thrift"