Update derive_param_diam_to_sev function

[vikrams95]

Feature Idea

• The output of the function should not be assigned to a name, i.e., df <- in line 216 should be removed. Otherwise the output is not displayed in the console and in the example on the website.
• Arguments starting with "filter_" should expect filter conditions. Here they expect variable values. I would rename them to something like diam_code or faobjj_values.
• derive_param_*() functions should create BDS parameters, i.e., at least PARAMCD should be set for the new records. If this is not intended, the function should be renamed to something like derive_severity_records().
• Do you expect gaps for the severity? E.g., mild = c(2, 4), mod = c(5, 10)? If not, you could simplify the arguments such that they expect the lower limit of the severity, i.e., the default would be none = 0, mild = 2, mod = 5, sev = 10.

Relevant Input

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Relevant Output

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Reproducible Example/Pseudo Code

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