Introduce missing MQMD fields to the ibmmq:Message

[ayeshLK]

Purpose

$subject

Fixes: #6964
Related to: #775

Examples

Using userId and accountingToken

// Open the Queue/Topic with `ibmmq:MQOO_SET_IDENTITY_CONTEXT` option enabled
Queue queue = check queueManager.accessQueue("DEV.QUEUE.1", .... | ibmmq:MQOO_SET_IDENTITY_CONTEXT);

string accountingToken = "<accounting-token>";
string userId = "<userId>";
check queue->put({
    accountingToken: accountingToken.toBytes(),
    userId,
    payload: "Hello world!".toBytes()
}, options = ibmmq:MQPMO_SET_IDENTITY_CONTEXT);

Using encoding and characterSet

json messageBody = {
    user: "Doe, John",
     id: 1234,
     description: "Regular application developer"
};
byte[] payload = messageBody.toJsonString().toBytes();
check queue->put({
    characterSet: ibmmq:MQCCSI_UTF8,
    encoding: ibmmq:MQENC_INTEGER_NORMAL,
    payload
});

Checklist

• Linked to an issue
• Updated the changelog
• Added tests
• Updated the spec
• Checked native-image compatibility

[codecov]

Codecov Report

Attention: Patch coverage is 77.77778% with 4 lines in your changes missing coverage. Please review.

Project coverage is 80.21%. Comparing base (d4abacf) to head (df544d3).
Report is 88 commits behind head on main.

Files with missing lines	Patch %	Lines
...n/java/io/ballerina/lib/ibm.ibmmq/CommonUtils.java	71.42%	0 Missing and 4 partials ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main      #56      +/-   ##
============================================
- Coverage     81.21%   80.21%   -1.00%     
- Complexity      104      121      +17     
============================================
  Files            20       20              
  Lines           958      935      -23     
  Branches         80       92      +12     
============================================
- Hits            778      750      -28     
- Misses          157      158       +1     
- Partials         23       27       +4     

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[NipunaRanasinghe]

LGTM