Feature/base telegram text bot

@all take a look

api/src/main/java/cz/cvut/fit/sp/bot_builder/text_bot/BaseTextBotHandler.java

+package cz.cvut.fit.sp.bot_builder.text_bot;
+
+import cz.cvut.fit.base.bot_builder.base.base_bot.BaseTextHandlerInterface;
+import cz.cvut.fit.base.bot_builder.base.base_bot.ChatBotTextAnswer;
+import cz.cvut.fit.base.bot_builder.base.base_bot.UserRequest;
+import lombok.Getter;
+import lombok.NonNull;
+import lombok.RequiredArgsConstructor;
+import lombok.Setter;
+import org.telegram.telegrambots.meta.api.methods.send.SendMessage;
+import org.telegram.telegrambots.meta.api.objects.Message;
+
+import java.util.Map;
+import java.util.Optional;
+
+@Getter
+@Setter
+@RequiredArgsConstructor
+public class BaseTextBotHandler implements BaseTextHandlerInterface {
+
+    @NonNull
+    private Map<UserRequest, ChatBotTextAnswer> botCommands;
+
+    @Override
+    public Optional<SendMessage> executeRequest(String chatId, String username, Message message) {
+        // Try to find user request in available requests list
+        Optional<Map.Entry<UserRequest, ChatBotTextAnswer>> request
+                = botCommands
+                .entrySet()
+                .stream()
+                .filter((req) -> req.getKey().equals(new UserRequest(message.getText()))).findFirst();
+        if (request.isEmpty()) {
+            // Request not found...
+            return Optional.empty();
+        }
+
+        return produceAnswer(request.get(), chatId);
+    }
+
+    @Override
+    public Optional<SendMessage> produceAnswer(Map.Entry<UserRequest, ChatBotTextAnswer> requestOptional, String chatId) {
+        return Optional.ofNullable(requestOptional.getValue().convertToMessage(chatId));
+    }
+}