DictTable: `insert!` and `delete!` don't work with named index column

[tkemmer]

Adding/removing rows to/from DictTables only seems to work when the index column does not have a name, e.g., when the table is constructed from dictionaries:

julia> idx = [1, 2, 3]; dt = DictTable(name = Dictionary(idx, ["A", "B", "C"]))
DictTable with 1 column and 3 rows:
     name
   ┌─────
 1 │ A
 2 │ B
 3 │ C

julia> delete!(dt, 1)
DictTable with 1 column and 2 rows:
     name
   ┌─────
 2 │ B
 3 │ C

julia> insert!(dt, 4, (name = "D",))
DictTable with 1 column and 3 rows:
     name
   ┌─────
 2 │ B
 3 │ C
 4 │ D

However, when creating a DictTable with a named index column, insert! and delete! throw errors:

julia> dt = DictTable(idx = [1, 2, 3], name = ["A", "B", "C"])
DictTable with 1 column and 3 rows:
 idx   name
 ────┬─────
 1   │ A
 2   │ B
 3   │ C

julia> delete!(dt, 1)
ERROR: TypeError: in Tokenized, in Parent, expected Parent<:AbstractDictionary, got Type{Int64}
Stacktrace:
 [1] tokenized(d::Indices{Int64})
   @ Dictionaries ~/.julia/packages/Dictionaries/7aBxp/src/tokens.jl:146
 [2] map
   @ ./tuple.jl:274 [inlined]
 [3] map(::Function, ::NamedTuple{(:idx, :name), Tuple{Indices{Int64}, Dictionary{Int64, String}}})
   @ Base ./namedtuple.jl:219
 [4] deletetoken!(d::DictTable{Int64, NamedTuple{(:idx, :name), Tuple{Int64, String}}, NamedTuple{(:idx, :name), Tuple{Indices{Int64}, Dictionary{Int64, String}}}, Indices{Int64}}, t::Tuple{Int64, Int64})
   @ TypedTables ~/.julia/packages/TypedTables/4OVef/src/DictTable.jl:170
 [5] delete!(d::DictTable{Int64, NamedTuple{(:idx, :name), Tuple{Int64, String}}, NamedTuple{(:idx, :name), Tuple{Indices{Int64}, Dictionary{Int64, String}}}, Indices{Int64}}, i::Int64)
   @ Dictionaries ~/.julia/packages/Dictionaries/7aBxp/src/insertion.jl:293
 [6] top-level scope
   @ REPL[86]:1

julia> insert!(dt, 4, (idx = 4, name = "D"))
ERROR: TypeError: in Tokenized, in Parent, expected Parent<:AbstractDictionary, got Type{Int64}
Stacktrace:
 [1] tokenized(d::Indices{Int64})
   @ Dictionaries ~/.julia/packages/Dictionaries/7aBxp/src/tokens.jl:146
 [2] map
   @ ./tuple.jl:274 [inlined]
 [3] map(::Function, ::NamedTuple{(:idx, :name), Tuple{Indices{Int64}, Dictionary{Int64, String}}})
   @ Base ./namedtuple.jl:219
 [4] gettoken!(d::DictTable{Int64, NamedTuple{(:idx, :name), Tuple{Int64, String}}, NamedTuple{(:idx, :name), Tuple{Indices{Int64}, Dictionary{Int64, String}}}, Indices{Int64}}, i::Int64)
   @ TypedTables ~/.julia/packages/TypedTables/4OVef/src/DictTable.jl:166
 [5] insert!(d::DictTable{Int64, NamedTuple{(:idx, :name), Tuple{Int64, String}}, NamedTuple{(:idx, :name), Tuple{Indices{Int64}, Dictionary{Int64, String}}}, Indices{Int64}}, i::Int64, value::NamedTuple{(:idx, :name), Tuple{Int64, String}})
   @ Dictionaries ~/.julia/packages/Dictionaries/7aBxp/src/insertion.jl:133
 [6] top-level scope
   @ REPL[87]:1

(Tested with Julia 1.9.3)