Add from_reader and use Read internally to improve the codegen of deku,
the performance of derived parsers. Internally, this is implemented
using the new src/reader.rs interface in deku parses. This has a waterfall
effect on DekuReader implementations and the deku-derive/deku_read Derived impl.
Previous usage with from_bytes and other API's are unchanged.
There is somewhat of a performance hit for bit-only parses,
but I find the major improvments in the bytes-wise parsing to be great enough
to warrent this change.

The following are some sample benchmarks:
> critcmp before after
group                  after                                  before
-----                  -----                                  ------
deku_read_bits         1.24   845.8±14.29ns        ? ?/sec    1.00   679.5±11.83ns        ? ?/sec
deku_read_byte         1.00     17.8±0.25ns        ? ?/sec    2.12     37.8±3.35ns        ? ?/sec
deku_read_enum         1.00     15.3±0.15ns        ? ?/sec    2.04     31.2±0.81ns        ? ?/sec
deku_read_vec          1.00    676.8±7.04ns        ? ?/sec    2.16  1459.5±40.22ns        ? ?/sec
deku_write_bits        1.00    125.3±3.10ns        ? ?/sec    1.04   130.2±11.12ns        ? ?/sec
deku_write_byte        1.00    161.6±4.86ns        ? ?/sec    1.02    165.0±5.91ns        ? ?/sec
deku_write_enum        1.00    105.6±1.06ns        ? ?/sec    1.03    109.0±7.20ns        ? ?/sec
deku_write_vec         1.00      4.6±0.04µs        ? ?/sec    1.06      4.9±0.07µs        ? ?/sec

The above change removes DekuRead, and replaces it with DekuReader. This contains
the from_reader_with_ctx. DekuContainerRead contains from_reader.

The crate no_std_io was picked to supply a Read impl
for the no_std feature. These are "re-export"ed.

Add "`Read` enabled" docs to lib.rs

Add tests/test_tuple.rs tests

Update CHANGELOG.md to reflect changes and help migration to this usage

Use llvm-cov in ci for the generation of more accurate coverage reports

Update benchmarks to test more complex parser speeds

Disable Miri CI

Update ensure_no_std to work with new Read usage. Remove wee-alloc in favour
of an updated crate for the allocator.

Add inline to small functions