[SPARK-3325][Streaming] Add a parameter to the method print in class DStream

[tdas]

This PR is a fixed version of the original PR #3237 by @watermen and @scwf.
This adds the ability to specify how many elements to print in DStream.print.

[tdas]

Jenkins, test this.

[SparkQA]

Test build #24981 has started for PR 3865 at commit 7c09f16.

• This patch merges cleanly.

[SparkQA]

Test build #24981 has finished for PR 3865 at commit 7c09f16.

• This patch fails Scala style tests.
• This patch merges cleanly.
• This patch adds no public classes.

[AmplabJenkins]

Test FAILed.
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Test FAILed.

[SparkQA]

Test build #24982 has started for PR 3865 at commit cd34e9e.

• This patch merges cleanly.

[SparkQA]

Test build #24982 has finished for PR 3865 at commit cd34e9e.

• This patch passes all tests.
• This patch merges cleanly.
• This patch adds no public classes.

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Test PASSed.
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Test PASSed.

[scwf]

lgtm

[tdas]

I have merged this. Thanks all!