convert pointer to encode

[binbin0325]

What this PR does:

When a user implements custom POJOs and uses non-pointer POJOs to encode, the encoding fails to transfer pojos forcibly. As a result, the program execution fails to meet expectations

When non-pointer structures are encoded, they are uniformly converted to Pointers for encoding

、
Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

Benchmark: 分别在struct以及pointer场景下 用串行以及8c并行 对当前pr与master进行对比。

// Benchmark_Struct_Encode 2231869 506.8 ns/op 560 B/op 7 allocs/op
// Benchmark_Struct_Encode-master 713761 1549 ns/op 560 B/op 8 allocs/op

// Benchmark_Pointer_Encode 2565778 476.1 ns/op 560 B/op 7 allocs/op
// Benchmark_Pointer_Encode-master 2328867 511.4 ns/op 576 B/op 8 allocs/op

// Benchmark_Struct_Encode_8 2307214 519.4 ns/op 560 B/op 7 allocs/op
// Benchmark_Struct_Encode_8-master 3104438 387.6 ns/op 560 B/op 8 allocs/op

// Benchmark_Pointer_Encode_8 2460842 476.7 ns/op 560 B/op 7 allocs/op
// Benchmark_Pointer_Encode_8-master 2254734 514.9 ns/op 576 B/op 8 allocs/op

当前master 对于struct 是非指针并且receiver是指针的情况下 性能和当前pr差距较大，其他的情况差距都还好。

[codecov-commenter]

Codecov Report

Merging #289 (948e953) into master (3a4ef0b) will decrease coverage by 0.18%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #289      +/-   ##
==========================================
- Coverage   70.26%   70.07%   -0.19%     
==========================================
  Files          27       27              
  Lines        3033     3041       +8     
==========================================
  Hits         2131     2131              
- Misses        677      683       +6     
- Partials      225      227       +2     

Impacted Files	Coverage Δ
codec.go	69.51% <100.00%> (+0.50%)	⬆️
encode.go	78.26% <100.00%> (+0.58%)	⬆️
serialize.go	66.66% <100.00%> (ø)
java_sql_time.go	61.11% <0.00%> (-5.56%)	⬇️
ref.go	83.78% <0.00%> (-2.71%)	⬇️
object.go	65.69% <0.00%> (-0.59%)	⬇️
pojo.go	64.11% <0.00%> (+0.17%)	⬆️

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[wongoo]

@sanxun0325 I think it's definition issue, if define JavaClassName on struct pointer , then not encode the non-pointer struct instance.

If u want encode the non-pointer struct instance, define JavaClassName on the struct directly.

[wongoo]

It's a compatibility feature to encode instance of non-pointer type, who is not POJO, while its pointer type is POJO.