feat(furvm): introduce executor

furvm/src/executor.cpp

@@ -0,0 +1,20 @@
+#include "furvm/executor.hpp"
+
+#include "furvm/context.hpp"
+
+namespace furvm {
+
+executor::executor(egzekutor, executor_handle id, const std::shared_ptr<context>& context)
+  : m_id(id), m_context(context) {}
+
+executor::~executor() {
+    m_context->m_executors[m_id] = nullptr;
+}
+
+std::shared_ptr<executor> executor::create(const std::shared_ptr<context>& context) {
+    auto ex = std::make_shared<executor>(egzekutor{}, context->m_executors.size(), context);
+    context->m_executors.push_back(ex);
+    return std::move(ex);
+}
+
+} // namespace furvm