Break changes between 0.1 and 0.2

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Here are all public api changes between 0.1 and 0.2:

BatchCommand::prepareQuery

Before: BatchCommand& prepareQuery() &;
After: BatchCommand& prepareQuery(bool value = true) &;

BatchCommand::getConsistency

Before: ConsistencyLevel getConsistency() const;
After: const std::optional<ConsistencyLevel>& getConsistency() const&;

BatchCommand::getSerialConsistency

Before: const std::pair<ConsistencyLevel, bool>& getSerialConsistency() const&;
After: const std::optional<ConsistencyLevel>& getSerialConsistency() const&;

BatchCommand::getDefaultTimestamp

Before: const std::pair<std::chrono::system_clock::time_point, bool>& getDefaultTimestamp() const&;
After: const std::optional<std::chrono::system_clock::time_point>& getDefaultTimestamp() const&;

Command::getQuery

Before: std::pair<const char*, std::size_t> getQuery() const&;
After: const StringHolder& getQuery() const&;

Command::getConsistency

Before: ConsistencyLevel getConsistency() const;
After: const std::optional<ConsistencyLevel>& getConsistency() const&;

Command::getPageSize

Before: const std::pair<std::size_t, bool>& getPageSize() const&;
After: const std::optional<std::size_t>& getPageSize() const&;

Command::getSerialConsistency

Before: const std::pair<ConsistencyLevel, bool>& getSerialConsistency() const&;
After: const std::optional<ConsistencyLevel>& getSerialConsistency() const&;

Command::getDefaultTimestamp

Before: const std::pair<std::chrono::system_clock::time_point, bool>& getDefaultTimestamp() const&;
After: const std::optional<std::chrono::system_clock::time_point>& getDefaultTimestamp() const&;

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sealed