sparkBar as an alias to sparkbar

[lingtaolf]

resolved: #58283

Changelog category (leave one):

• Improvement

Changelog entry (a user-readable short description of the changes that goes to CHANGELOG.md):

sparkBar as an alias to sparkbar

Documentation entry for user-facing changes

• Documentation is written (mandatory for new features)

Information about CI checks: https://clickhouse.com/docs/en/development/continuous-integration/

[bharatnc]

I think it's better to simply just do:

Suggested change

	factory.registerFunction("sparkbar", createAggregateFunctionSparkbar);
	factory.registerFunction("sparkbar", createAggregateFunctionSparkbar, AggregateFunctionFactory::CaseInsensitive);

In this way, it will cover additional cases too like sparkBar, SparkBar, 'Sparkbar' etc.

[lingtaolf]

@bharatnc I'm not sure covering all situations is what they need.

[robot-clickhouse]

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[alexey-milovidov]

Thank you! I like the current way, where the function is case-sensitive with just two options.