GH-46118: [C++] Add tensor directory to Meson (#46119)

### Rationale for this change

Continually improves Meson implementation

### What changes are included in this PR?

This adds the tensor directory

### Are these changes tested?

Yes

### Are there any user-facing changes?

No
* GitHub Issue: #46118

Authored-by: Will Ayd <[email protected]>
Signed-off-by: Will Ayd <[email protected]>

Author: WillAyd

cpp/src/arrow/meson.build

@@ -544,6 +544,7 @@ subdir('testing')
 
 subdir('c')
 subdir('io')
+subdir('tensor')
 subdir('util')
 
 gflags_dep = dependency('gflags', include_type: 'system')

cpp/src/arrow/tensor/meson.build

@@ -0,0 +1,25 @@
+# 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.
+
+install_headers(['converter.h'], subdir: 'arrow/tensor')
+
+exc = executable(
+    'arrow-tensor-conversion-benchmark',
+    sources: ['tensor_conversion_benchmark.cc'],
+    dependencies: [arrow_benchmark_dep],
+)
+benchmark('arrow-tensor-conversion-benchmark', exc)