[RFC] Make string length for getTraceAsString() configurable

Add a `zend.exception_string_param_max_len` ini setting.
(same suffix as `log_errors_max_len`)

Allow values between

[RFC] Make string length for getTraceAsString() configurable

Add a `zend.exception_string_param_max_len` ini setting.
(same suffix as `log_errors_max_len`)

Allow values between 0 and 1000000 bytes.
For example, with zend.exception_string_param_max_len=0,
"" would represent the empty string, and "..." would represent something
longer than the empty string.
Previously, this was hardcoded as exactly 15 bytes.

Discussion: https://externals.io/message/110717

Closes GH-5769

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