feat: Add create command of cobj-idx

[yutaro-sakamoto]

This pull request implements create command of cobj-idx.
The following is a usage of this new command.

cobj-idx create <indexed file> --size=<record size> --key=<key information>
    Create a new indexed file.
    The record size and key information are specified by the options.
    By default, this command does not overwrite the indexed file.
    To overwrite the indexed file, use the --new option.
    Example) cobj-idx create test.idx --size=100 --key=2,2:5,4:d15,5
             File name: test.idx
             Record size: 100
             Primary key: 2-3
             Alternate key (No Duplicates):5-8
             Alternate key (Duplicates): 15-19

[Copilot]

Pull Request Overview

This pull request adds a new "create" command to the cobj-idx tool including tests, Java command parsing, and file creation logic.

• Implements the creation of an indexed file with key and record size validations.
• Updates tests and build scripts (Makefile.in and Makefile.am) to include the new create command functionality.
• Enhances the Java code to validate command line arguments and key formats for file creation.

Reviewed Changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
tests/cobj-idx.src/create.at	New tests covering the basic create command and error cases for missing or invalid arguments.
tests/cobj-idx.at, Makefile.in, Makefile.am	Updated to include the new create.at dependency.
IndexedFileUtilMain.java	New branch for handling the create command including parsing, validation, and file creation logic.
CobolFileKeyInfo.java	New helper class to encapsulate key information.
libcobj/Makefile.in, Makefile.am	Updated to include CobolFileKeyInfo in the build.

Comments suppressed due to low confidence (2)

libcobj/app/src/main/java/jp/osscons/opensourcecobol/libcobj/user_util/indexed_file/IndexedFileUtilMain.java:261

• The regex used in parseKeyOptions is complex; consider adding inline comments to document the expected key format for improved readability and maintainability.

Pattern pattern = Pattern.compile("[1-9][0-9]*,[1-9][0-9]*(:d?[1-9][0-9]*,[1-9][0-9]*)*");

libcobj/app/src/main/java/jp/osscons/opensourcecobol/libcobj/user_util/indexed_file/IndexedFileUtilMain.java:747

• The boundary check using 'recordSize + 1' is not immediately clear; please add a comment explaining the rationale behind this condition to aid future maintenance.

if (keyInfo.offset <= 0 || keyInfo.size <= 0 || keyInfo.offset + keyInfo.size > recordSize + 1) {