Write buffer prep

[uramirez8707]

Description
To prepare for the write_buffer update:

1. The buffer_ids were added to the diag_file object (this is needed to loop through them and write in diag_send_complete)
2. Adds the functionality to get the size of the subaxis (this is needed so that the subregional variables can be allocated to the correct size)
3. Adds the field id and yaml id to the output_buffer object (this is needed so that we can get information about the variable when writing for the variable)

Fixes # (issue)

How Has This Been Tested?
CI

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• Any dependent changes have been merged and published in downstream modules
• New check tests, if applicable, are included
• make distcheck passes

[thomas-robinson]

The name of this routine is a bit misleading. It only adds one ID, but ids is plural in the routine name.

[uramirez8707]

21f74ed

[thomas-robinson]

"Adds the field id and yaml id to the output_buffer object (this is needed so that we can get information about the variable when writing for the variable)"
Writing is done on a file level, and the file object should have all of this information. So why does the buffer object need this?

[thomas-robinson]

"Adds the field id and yaml id to the output_buffer object (this is needed so that we can get information about the variable when writing for the variable)"
Writing is done on a file level, and the file object should have all of this information. So why does the buffer object need this?

[uramirez8707]

"Adds the field id and yaml id to the output_buffer object (this is needed so that we can get information about the variable when writing for the variable)" Writing is done on a file level, and the file object should have all of this information. So why does the buffer object need this?

We are looping through the buffer_ids for the file. The field_ids in the diag file object do not necessary correspond to the buffer_ids (i.e buffer_ids(i) may not be the buffer for field_ids(i)). They were added to the file as the fields were registering/data was sent.