chore: update pyproject authors and add CITATION.cff (#589)

* chore: update pyproject authors and add CITATION.cff

- Replace individual authors with Mellea Contributors team
- Add CITATION.cff with founding authors for academic citation

Closes #584
Part of #453

Signed-off-by: Alex Bozarth <ajbozart@us.ibm.com>

* chore: remove CITATION.cff file

Based on PR review feedback, removing CITATION.cff as GitHub's built-in citation feature is sufficient and avoids the complexity of determining original authors.

Signed-off-by: Alex Bozarth <ajbozart@us.ibm.com>

---------

Signed-off-by: Alex Bozarth <ajbozart@us.ibm.com>

Author: ajbozarth

pyproject.toml

@@ -6,15 +6,7 @@ build-backend = "pdm.backend"
 name = "mellea"
 version = "0.3.2"
 authors = [
-    { name = "Nathan Fulton", email = "nathan@ibm.com" },
-    { name = "Hendrik Strobelt", email = "hendrik.strobelt@ibm.com" },
-    { name = "Avinash Balakrishnan", email = "avinash.bala@us.ibm.com" },
-    { name = "Elron Bandel", email = "elron.bandel@ibm.com" },
-    { name = "Masataro Asai", email = "masataro.asai@ibm.com" },
-    { name = "Supriya Lall", email = "supriya.lall@partner.ibm.com" },
-    { name = "Xiaojie Guo", email = "xiaojie.guo@ibm.com" },
-    { name = "Jake LoRocco", email = "jake.lorocco@ibm.com" },
-    { name = "Ja Young Lee", email = "Ja.Young.Lee@ibm.com" },
+    { name = "Mellea Contributors", email = "melleaadmin@ibm.com" },
 ]
 description = "mellea is a library for writing generative programs"
 readme = "README.md"