[feature suggestion] Save/restore UHDM in-memory

[yurivict]

Currently Serializer has only methods to serialize to disk:

void Save(const std::filesystem::path& filepath);
const std::vector<vpiHandle> Restore(const std::filesystem::path& filepath);

There shouldn't be a requirement to write/read to disk just in order to serialize/unserialize data for performance reasons. Disk IO often becomes a performance bottleneck. Many places have killed disks.

I suggest that in-memory serialization/unserialization is also supported:

void Save(std::vector<uint8_t>& data);
const std::vector<vpiHandle> Restore(const std::vector<uint8_t>& data);

This can be useful in case UHDMs are stored and used in memory and there is no need to go to disk other than the requirement of the above interface.

[hs-apotell]

I would recommend this -

void Save(std::ostream& strm);
std::vector<vpiHandle> Restore(std::istream& strm);