Fix location for span infos, report better error locations in repl

[jmcardon]

Closes #262

Using the example in #262:

Before this PR:

pact>(load "scratch/main-script.repl" true)
"Loading scratch/main-script.repl..."
"Loading nested-script.repl..."
Loaded repl defun just-fail
scratch/main-script.repl:12:2: We fail
 12 | ; Hello
    |   ^^^^^^^^^^^^^^^^^^^^^^^^^
  at (#repl.just-fail.{I3JlcGw})

After this PR:

pact>(load "scratch/main-script.repl" true)
"Loading scratch/main-script.repl..."
"Loading nested-script.repl..."
Loaded repl defun just-fail
()
scratch/nested-script.repl:12:2: We fail
 12 |   (enforce false "We fail")
    |   ^^^^^^^^^^^^^^^^^^^^^^^^^
  at(#repl.just-fail.{I3JlcGw}):scratch/main-script.repl 2:0-2:11

PR checklist:

• Test coverage for the proposed changes
• PR description contains example output from repl interaction or a snippet from unit test output
• (If Relevant) Documentation has been (manually) updated at https://docs.kadena.io/pact

Additionally, please justify why you should or should not do the following:

• Benchmark regressions
• Confirm replay/back compat (Ignore until core release)
• (For Kadena engineers) Run integration-tests against a Chainweb built with this version of Pact (Ignore until core release)