lib: add KUnit tests for base64 encoding/decoding

lib: add KUnit tests for base64 encoding/decoding

Add a KUnit test suite to validate the base64 helpers.  The tests cover
both encoding and decoding, including padded and unpadded forms as defined
by RFC 4648 (standard base64), and add negative cases for malformed inputs
and padding errors.

The test suite also validates other variants (URLSAFE, IMAP) to ensure
their correctness.

In addition to functional checks, the suite includes simple
microbenchmarks which report average encode/decode latency for small (64B)
and larger (1KB) inputs.  These numbers are informational only and do not
gate the tests.

Kconfig (BASE64_KUNIT) and lib/tests/Makefile are updated accordingly.

Sample KUnit output:

    KTAP version 1
    # Subtest: base64
    # module: base64_kunit
    1..4
    # base64_performance_tests: [64B] encode run : 32ns
    # base64_performance_tests: [64B] decode run : 35ns
    # base64_performance_tests: [1KB] encode run : 510ns
    # base64_performance_tests: [1KB] decode run : 530ns
    ok 1 base64_performance_tests
    ok 2 base64_std_encode_tests
    ok 3 base64_std_decode_tests
    ok 4 base64_variant_tests
    # base64: pass:4 fail:0 skip:0 total:4
    # Totals: pass:4 fail:0 skip:0 total:4

Link: https://lkml.kernel.org/r/20251114060157.89507-1-409411716@gms.tku.edu.tw
Signed-off-by: Guan-Chun Wu <409411716@gms.tku.edu.tw>
Reviewed-by: Kuan-Wei Chiu <visitorckw@gmail.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: David Laight <david.laight.linux@gmail.com>
Cc: Eric Biggers <ebiggers@kernel.org>
Cc: Ilya Dryomov <idryomov@gmail.com>
Cc: Jaegeuk Kim <jaegeuk@kernel.org>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Keith Busch <kbusch@kernel.org>
Cc: Sagi Grimberg <sagi@grimberg.me>
Cc: "Theodore Y. Ts'o" <tytso@mit.edu>
Cc: Viacheslav Dubeyko <Slava.Dubeyko@ibm.com>
Cc: Xiubo Li <xiubli@redhat.com>
Cc: Yu-Sheng Huang <home7438072@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>