Automatic block size for data set allocation

[adam-wolfe]

Is your feature request related to a problem? Please describe.

In ISPF, users can specify a block size of 0 when allocating a data set to let the system pick a block size based on the lrecl. However, specifying a block size of 0 in Zowe Explorer results in a data set being allocated with a block size that is equal to the lrecl.

Describe the solution you'd like

Ideally, users would be able to enter a lrecl and record format, then specify block size of 0 and assume that the system will allocate the data set with an optimal block size.

Describe alternatives you've considered

Additional context

Relevant IBM articles:
https://www.ibm.com/docs/en/zos/3.1.0?topic=attributes-block-size-record-length
https://www.ibm.com/docs/en/zos/3.1.0?topic=blksize-system-determined-block-size

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