uri: optimize allocation of parameters and their values dynamic arrays

Allocation of URI parameters and their values dynamic arrays is done
inefficiently: they are reallocated each time a new parameter or parameter
value is added — grow them exponentially instead.

`struct uri_param` and `struct uri` are exposed in Lua via FFI
(see src/lua/uri.lua): add warnings about the necessity of reflecting
changes to them in `ffi.cdecl`.

Closes #7155

NO_DOC=optimization
NO_TEST=optimization