Project refactor, add anthropic API support

- Split pkg/cli/cmd.go into new pkg/cmd package
- Split pkg/cli/functions.go into pkg/lmcli/tools package
- Refactor pkg/cli/openai.go to pkg/lmcli/provider/openai

Other changes:

- Made models configurable
- Slight config reorganization

pkg/cmd/clone.go

@@ -0,0 +1,72 @@
+package cmd
+
+import (
+	"fmt"
+
+	cmdutil "git.mlow.ca/mlow/lmcli/pkg/cmd/util"
+	"git.mlow.ca/mlow/lmcli/pkg/lmcli"
+	"git.mlow.ca/mlow/lmcli/pkg/lmcli/model"
+	"github.com/spf13/cobra"
+)
+
+func CloneCmd(ctx *lmcli.Context) *cobra.Command {
+	cmd := &cobra.Command{
+		Use:   "clone <conversation>",
+		Short: "Clone conversations",
+		Long:  `Clones the provided conversation.`,
+		Args: func(cmd *cobra.Command, args []string) error {
+			argCount := 1
+			if err := cobra.MinimumNArgs(argCount)(cmd, args); err != nil {
+				return err
+			}
+			return nil
+		},
+		RunE: func(cmd *cobra.Command, args []string) error {
+			shortName := args[0]
+			toClone, err := cmdutil.LookupConversationE(ctx, shortName)
+			if err != nil {
+				return err
+			}
+
+			messagesToCopy, err := ctx.Store.Messages(toClone)
+			if err != nil {
+				return fmt.Errorf("Could not retrieve messages for conversation: %s", toClone.ShortName.String)
+			}
+
+			clone := &model.Conversation{
+				Title: toClone.Title + " - Clone",
+			}
+			if err := ctx.Store.SaveConversation(clone); err != nil {
+				return fmt.Errorf("Cloud not create clone: %s", err)
+			}
+
+			var errors []error
+			messageCnt := 0
+			for _, message := range messagesToCopy {
+				newMessage := message
+				newMessage.ConversationID = clone.ID
+				newMessage.ID = 0
+				if err := ctx.Store.SaveMessage(&newMessage); err != nil {
+					errors = append(errors, err)
+				} else {
+					messageCnt++
+				}
+			}
+
+			if len(errors) > 0 {
+				return fmt.Errorf("Messages failed to be cloned: %v", errors)
+			}
+
+			fmt.Printf("Cloned %d messages to: %s\n", messageCnt, clone.Title)
+			return nil
+		},
+		ValidArgsFunction: func(cmd *cobra.Command, args []string, toComplete string) ([]string, cobra.ShellCompDirective) {
+			compMode := cobra.ShellCompDirectiveNoFileComp
+			if len(args) != 0 {
+				return nil, compMode
+			}
+			return ctx.Store.ConversationShortNameCompletions(toComplete), compMode
+		},
+	}
+	return cmd
+}