Add the support of the BLMPOP command

[infdahai]

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• I had searched in the issues and found no similar issues.

Motivation

This issue considers to support the blmpop command.

Solution

No response

Are you willing to submit a PR?

• I'm willing to submit a PR!

[Yangsx-1]

Is it better to implement together with LMPOP？They are very similar.

[xonx4l]

i got a pr for it . PointCloudLibrary/pcl#5754.

[zevin02]

please assign to me

[HolyLow]

@git-hulk Hello, I've just finished the LMPOP command, and seems this BLMPOP command is quite similar (just adding the Blocking semantic), so maybe you could assign this one to me as well.

[git-hulk]

@HolyLow Sure, thanks for your contribution.

[git-hulk]

@PragmaTwice @torwig We have many blocking commands, so we copy the blocking implementation codes in many places, not sure if we can simplify this.