dynamic reflection

[qicosmos]

动态反射，支持根据名称创建对象，根据字段名去设置字段的值，获取所有的字段名等等。

struct pair_t : public iguana::pb_base_impl<pair_t> {
  pair_t() = default;
  pair_t(int a, int b) : x(a), y(b) {}
  int x;
  int y;
};
REFLECTION(pair_t, x, y);

  {
    auto t = iguana::create_instance("pair_t");
    t->set_field_value("x", 12);
    t->set_field_value("y", 24);
    auto &r0 = t->get_field_value<int>("x");
    CHECK(r0 == 12);
    auto &r = t->get_field_value<int>("y");
    CHECK(r == 24);
    
    std::vector<std::string> all_fields_name = t->get_fields_name();

    std::string str;
    t->to_pb(str);

    pair_t t1;
    t1.from_pb(str);

    pair_t *st = dynamic_cast<pair_t *>(t.get());
    CHECK(st->x == t1.x);
    CHECK(st->y == t1.y);
  }

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 68.57143% with 22 lines in your changes are missing coverage. Please review.

Project coverage is 47.25%. Comparing base (c5e96a7) to head (1a2f7de).
Report is 102 commits behind head on master.

Files	Patch %	Lines
iguana/reflection.hpp	53.12%	15 Missing ⚠️
iguana/pb_util.hpp	58.82%	7 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #285      +/-   ##
==========================================
+ Coverage   45.19%   47.25%   +2.05%     
==========================================
  Files          46       52       +6     
  Lines        5677     6137     +460     
==========================================
+ Hits         2566     2900     +334     
- Misses       3111     3237     +126     

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