RD-10763: Replace maybeType by a Decl in ProgramDescription

[bgaidioz]

See the JIRA and its related subtasks for all details.

That one is only a fraction of the fix. It permits to describe an SQL program as:

• no declarations in the decls Map (it has no user declared functions),
• a defined maybeRunnable declaration as value. With parameters (potentially an empty list if none).

and a Snapi program as:

• its usual list of declarations, the top-level functions,
• if it has a final value, a defined maybeRunnable declaration: parameter-less since Snapi doesn't support to evaluate a program as a function.
• if it has no final value, an undefined maybeRunnable.

The rest of the patch are fixes to the SQL test codes that are testing the compiler API.

[bgaidioz]

/publish

will publish utils version: 0.28.40+1-d1891909-SNAPSHOT
will publish client version: 0.28.40+1-d1891909-SNAPSHOT
will publish snapi-parser version: 0.28.40+1-d1891909-SNAPSHOT
will publish snapi-frontend version: 0.28.40+1-d1891909-SNAPSHOT
will publish snapi-truffle version: 0.28.40+1-d1891909-SNAPSHOT
will publish snapi-client version: 0.28.40+1-d1891909-SNAPSHOT
will publish sql-client version: 0.28.40+1-d1891909-SNAPSHOT
published
run 8299258530 success ✔️