Enable bisecting failing conversions

[t0yv0]

In the rare case when the bulk example converter panics, the experience of isolating the failing example and reporting a bug does not spark joy. This little change introduces a bisect algo that tries to narrow down an example-set to the one failing example, and also a better error reporting mechanism that prints a repro.sh in a temp folder where the maintainer can inspect further.

[codecov]

Codecov Report

Attention: Patch coverage is 15.21739% with 78 lines in your changes are missing coverage. Please review.

Project coverage is 60.00%. Comparing base (45d8f28) to head (f09c258).
Report is 1 commits behind head on master.

Files	Patch %	Lines
pkg/tfgen/convert_cli.go	15.21%	71 Missing and 7 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1880      +/-   ##
==========================================
- Coverage   60.06%   60.00%   -0.06%     
==========================================
  Files         323      327       +4     
  Lines       43894    43976      +82     
==========================================
+ Hits        26363    26388      +25     
- Misses      16040    16097      +57     
  Partials     1491     1491              

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[iwahbe]

LGTM

A test would be great, but since this doesn't go out to pulumi users I'm fine without.

[t0yv0]

The happy path is under test and the error path I got to use to diagnose pulumi/pulumi-digitalocean#683 issue.