add transformers for bf16 and f16 data-type

[shanghaikid]

we shouldn't do the data transform by default for bf16 and f16 data type, although it doesn't exist in javascript. but we provide these helpers: f32ArrayToF16Bytes f16BytesToF32Array f32ArrayToBf16Bytes bf16BytesToF32Array

So that user can use in the insert, query, search api. like this

 const insert = await milvusClient.insert({
      collection_name: COLLECTION_NAME,
      data: data,
      transformers: {
        [DataType.BFloat16Vector]: f32ArrayToBf16Bytes,
      },
    });

const query = await milvusClient.query({
      collection_name: COLLECTION_NAME,
      filter: 'id > 0',
      output_fields: ['vector', 'id'],
      transformers: {
        [DataType.BFloat16Vector]: bf16BytesToF32Array,
      },
    });

const search = await milvusClient.search({
      vector: data[0].vector,
      collection_name: COLLECTION_NAME,
      output_fields: ['id', 'vector'],
      limit: 5,
      transformers: {
        [DataType.BFloat16Vector]: bf16BytesToF32Array,
      },
    });

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Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 97.51%. Comparing base (e9fcf68) to head (44223e2).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## 2.4 #303 +/- ## ========================================== + Coverage 97.45% 97.51% +0.05% ========================================== Files 36 37 +1 Lines 2238 2249 +11 Branches 608 615 +7 ========================================== + Hits 2181 2193 +12 + Misses 52 51 -1 Partials 5 5 ```

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