Better Error Handling

- [ ] Review or add more verbose debug messages
- [x] https://github.com/Urigo/graphql-mesh/issues/4141
- [x] https://github.com/Urigo/graphql-mesh/issues/3978
- [ ] https://github.com/Urigo/graphql-mesh/issues/3951
- [x] https://github.com/Urigo/graphql-mesh/issues/4126
- [x] https://github.com/Urigo/graphql-mesh/issues/565
- [ ] https://github.com/Urigo/graphql-mesh/issues/591
- [x] https://github.com/Urigo/graphql-mesh/issues/895
- [ ] https://github.com/Urigo/graphql-mesh/issues/1725
- [ ] https://github.com/Urigo/graphql-mesh/issues/1906
- [ ] https://github.com/Urigo/graphql-mesh/issues/2103
- [x] https://github.com/Urigo/graphql-mesh/issues/2279
- [ ] https://github.com/Urigo/graphql-mesh/issues/2968
- [ ] https://github.com/Urigo/graphql-mesh/issues/3367
- [ ] https://github.com/Urigo/graphql-mesh/issues/3433
- [ ] https://github.com/Urigo/graphql-mesh/issues/3449
- [ ] https://github.com/Urigo/graphql-mesh/issues/3508
- [x] https://github.com/Urigo/graphql-mesh/issues/3694
- [x] https://github.com/Urigo/graphql-mesh/issues/3711
- [x] https://github.com/Urigo/graphql-mesh/issues/3739
- [x] https://github.com/Urigo/graphql-mesh/issues/4096
- [x] https://github.com/Urigo/graphql-mesh/issues/4308

Start by reviewing the unchecked linked issues, especially those describing missing debug messages or error handling, because this issue names no files or tests. Narrow the work to one concrete item, then define done as that item being addressed and verified without leaving the broader checklist ambiguous.

Written by the indexing model from the issue text.