feat (DAL): client-side support for float4

[kevin-dp]

This PR adds client-side support for float4.
Numbers provided by the user are rounded to the nearest float4 representation using Math.fround().
Similarly, when numbers are read from a float4 column in the DB they are rounded to the nearest float4 representation.
This would not strictly be necessary if all writes happen through the DAL but because of SQLite's dynamic typing, users can write larger/smaller numbers to float4 columns in which case we would read numbers that fall out of range.

[linear]

VAX-849 DAL: add support for float4 type

Reference: https://electric-sql.slab.com/posts/on-data-validation-and-postgres-data-type-support-tpegouhj#h1sz5-supporting-basic-postgres-types-in-electric.

• Add client-side validations to ensure only floats that fall into float4's range get written to SQLite. This can be achieved with the help of Math.fround() which returns +-Infinity if given a floating point that has a magnitude that's too large or +-0.0 if the magnitude is too small for a 32-bit floating point representation

[alco]

Awesome!