fix: replace JsonlDataParse with JSONDataParse to match Sedna API

[31groot]

What type of PR is this?
/kind bug

What this PR does / why we need it:
dataset.py was importing JsonlDataParse and JSONMetaDataParse from
sedna.datasources, but these names do not exist in current Sedna.
Sedna renamed JsonlDataParse to JSONDataParse and JSONMetaDataParse
was never implemented. This caused an ImportError on every fresh install,
which blocks all examples from running.

Changes:

• Replace JsonlDataParse with JSONDataParse
• Remove duplicate JSONDataParse import
• Replace JSONMetaDataParse with JSONDataParse as fallback for JSONFORLLM format

Which issue(s) this PR fixes:
Fixes #563

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[gemini-code-assist]

Code Review

This pull request simplifies dataset parsing in core/testenvmanager/dataset/dataset.py by removing JsonlDataParse and JSONMetaDataParse and replacing them with JSONDataParse for both JSONL and JSONFORLLM formats. The reviewer suggested an improvement to chain the sequential if statements checking data_format using elif to avoid redundant evaluations.

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[gemini-code-assist]

Since data_format can only match one of the DatasetFormat values, these sequential if statements should be chained using elif. This avoids redundant condition evaluations once a match has been found.

Suggested change

	if data_format == DatasetFormat.JSONL.value:
	data = JsonlDataParse(data_type=data_type, func=feature_process)
	data = JSONDataParse(data_type=data_type, func=feature_process)
	data.parse(file)
	if data_format == DatasetFormat.JSONFORLLM.value:
	data = JSONMetaDataParse(data_type=data_type, func=feature_process)
	data = JSONDataParse(data_type=data_type, func=feature_process)
	data.parse(file, **kwargs)
	elif data_format == DatasetFormat.JSONL.value:
	data = JSONDataParse(data_type=data_type, func=feature_process)
	data.parse(file)
	elif data_format == DatasetFormat.JSONFORLLM.value:
	data = JSONDataParse(data_type=data_type, func=feature_process)
	data.parse(file, **kwargs)