Fix incremental JSON parser numeric token reassembly across chunks.

Fix incremental JSON parser numeric token reassembly across chunks.

When the incremental JSON parser splits a numeric token across chunk
boundaries, it accumulates continuation characters into the partial
token buffer.  The accumulator's switch statement unconditionally
accepted '+', '-', '.', 'e', and 'E' as valid numeric continuations
regardless of position, which violated JSON number grammar
(-? int [frac] [exp]).  For example, input "4-" fed in single-byte
chunks would accumulate the '-' into the numeric token, producing an
invalid token that later triggered an assertion failure during
re-lexing.

Fix by tracking parser state (seen_dot, seen_exp, prev character)
across the existing partial token and incoming bytes, so that each
character class is accepted only in its grammatically valid position.

Backpatch-through: 17