Chore: Separate repl into separate project, fix REPL docs output

[jmcardon]

This PR separates the REPL into its own sub-library which helpful for fixing several issues:

• This improves the compile times of pact-5 for the sake of chainweb integration.
• It allows us to pull in pandoc, which fixes in our docs issues where our docs in the repl look like the raw markdown docs.

Before this PR:

After this PR:

PR checklist:

• [x] Test coverage for the proposed changes
• [x] PR description contains example output from repl interaction or a snippet from unit test output
• [x] (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:

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

[jmcardon]

As of my last commit, it also fixes an annoying issue in the pact-5 repl that repl functions were actually going through the gas charging method, which when it actually charges gas, will essentially brick the repl.

The following is now possible:

pact>(env-gasmodel "table")
"Set gas model to table-based cost model"
pact>(env-gaslimit 1)
"Set gas limit to 1"
pact>(env-gas
env-gas             env-gaslimit        env-gaslog          env-gasmodel        env-gasmodel-fixed
pact>(+ "hello" "world")
(interactive):1:0: Gas limit "1"exceeded: 2
 1 | (+ "hello" "world")
   | ^^^^^^^^^^^^^^^^^^^

pact>(env-gas 0)
"Set gas to 0"