Remove arraySize parameter from the get method of the FTP Client API

[Maninda]

Purpose

1. Resolves Remove arraySize parameter from the get method of the FTP Client API ballerina-library#1940
2. Improve rmdir test cases

Checklist

• Linked to an issue
• Updated the changelog
• Added tests

[codecov]

Codecov Report

Merging #401 (7a4cf16) into master (b7597d7) will increase coverage by 0.82%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##             master     #401      +/-   ##
============================================
+ Coverage     81.91%   82.74%   +0.82%     
- Complexity      186      187       +1     
============================================
  Files            29       29              
  Lines          1106     1101       -5     
  Branches        166      165       -1     
============================================
+ Hits            906      911       +5     
+ Misses          144      134      -10     
  Partials         56       56              

Impacted Files	Coverage Δ
ballerina/listener_endpoint.bal	93.18% <ø> (ø)
...ava/io/ballerina/stdlib/ftp/util/FtpConstants.java	100.00% <ø> (ø)
ballerina/byte_stream.bal	84.37% <100.00%> (-0.48%)	⬇️
ballerina/client_endpoint.bal	97.56% <100.00%> (-0.06%)	⬇️
...java/io/ballerina/stdlib/ftp/client/FtpClient.java	84.57% <100.00%> (-0.09%)	⬇️
...o/ballerina/stdlib/ftp/client/FtpClientHelper.java	83.90% <100.00%> (+0.95%)	⬆️
...ftp/transport/server/RemoteFileSystemConsumer.java	70.70% <0.00%> (+6.06%)	⬆️
...tractimpl/RemoteFileSystemServerConnectorImpl.java	80.00% <0.00%> (+10.00%)	⬆️

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[Bhashinee]

When making the WatchEvent read-only, shouldn't we change the native code accordingly?
https://github.com/ballerina-platform/module-ballerina-ftp/blob/master/native/src/main/java/io/ballerina/stdlib/ftp/server/FtpListener.java#L98

by using ValueCreator.createReadonlyRecordValue(...)

[Maninda]

When making the WatchEvent read-only, shouldn't we change the native code accordingly?
https://github.com/ballerina-platform/module-ballerina-ftp/blob/master/native/src/main/java/io/ballerina/stdlib/ftp/server/FtpListener.java#L98

by using ValueCreator.createReadonlyRecordValue(...)

As discussed offline and after some attempts to implement this change which caused some inconsistencies, I have reverted back the changes related to making the WatchEvent as readonly.