IDLE: Handle repr(big_integer) value error

[terryjreedy]

(Spinoff of #135487.) In Shell

>>> 1<<15000
Traceback (most recent call last):
  File "<pyshell#38>", line 1, in <module>
    1<<15000
ValueError: Exceeds the limit (4300 digits) for integer string conversion; use sys.set_int_max_str_digits() to increase the limit

The error also occurs in Debugger. For debugger, I have already thought replacing reprlib.repr since debugger displays only about the first 40 chars of the repr string. First possibility: f"int(10**{log10(n)})". It returns a legal expression, but large-enough exponents overflow. Second: f"10**round({log10(n)}) # Approximately. This will evaluate to an order of magnitude approximation, which is often better than 100s or 1000s of digits. In Shell, the error message could follow as a comment. In debugger, I would like to add hovertips with more information.