Enhance autoprec function in mpmath library for precision control and early termination

[LlirikOknessu]

Description:

The current autoprec function in mpmath lacks flexibility in controlling precision increase and does not support early termination upon the first successful computation. This issue proposes adding features to address these limitations.

Proposed Changes:

Control Precision Increase Rate: Modify autoprec to accept a parameter (learning rate) to regulate the speed of precision increase.

Early Termination on First Successful Computation: Extend autoprec to include a parameter (early_termination) to stop precision increase upon the first successful computation.

Expected Benefits:

Enhanced user control: Users can adjust precision increase rate.
Improved usability: Early termination feature allows efficient handling of cases where computational accuracy is not critical.