Keep a shared SQL signature on the function whose parameters it fits

[estebanzimanyi]

attach_claims_fit, run once the object model and the type relations are attached, gathers the
SQL signatures two or more public functions claim; where the arguments of one fit the C input
parameters of a claimant, in their order or the one other order a wrapper passes them in, with
the bound parameters and the out-parameters taking no argument, as _Resolver.params of
parser/compositions.py matches a call, every claimant whose parameters they do not fit gives
it up. A signature no claimant or every claimant fits stays where it is, a signature one
function claims is untouched, and a function left with signatures under another name takes
that name as its sqlfn. test_claims_fit.py states the typed kernels of one box wrapper, a bound
parameter, and the three cases left alone.

Witness: Tbox_value_tiles backs valueTiles over tbox with integer, bigint and float sizes, and
tintbox_value_tiles, tbigintbox_value_tiles and tfloatbox_value_tiles each claimed all three
signatures, since the type scope that chose them names the box they all take. A binding
calls the first claimant it meets: the Spark SQL surface answered
valueTiles(tbox(tint), 1, 0, true) through tbigintbox_value_tiles, which raised "The span must
be of type bigintspan". teq_bool_tbool claimed tEqual(integer, tint) the same way.

Why: a binding names the C function of a signature from the catalog alone, so a signature
claimed by a function whose parameters it does not fit sends the call to the wrong kernel, and
a Java int widening to a long or a double hides the mismatch from the compiler.

Measured: over MobilityDB 43cfd3f936 the catalog gives up 48 signatures across 15 functions:
the value tiles, expand, shift and scale functions of the int, bigint and float boxes, the
tEqual and tNotEqual of tbool beside the other base types, aDisjoint(tcbuffer, geometry) on
adisjoint_tcbuffer_cbuffer and cellToChildren(quadbin, integer) on quadbin_cell_to_children;
no other field of any function changes. pytest tests/ answers 473 passed and 11 skipped with
MDB_SRC_ROOT set.