sql: changing name column type to binary type

[zhijian-pro]

This pr is mainly to solve the problem that juicefs cannot create files whose filenames are not UTF8 encoded when using the sql type of metadata engine
To solve this problem, the metadata database field type needs to be updated, so there is a certain compatibility problem with the old version. The following is a smooth upgrade scheme for upgrading the old version to this version:

1. If there are old clients in mount state, they can be upgraded without stopping them
2. Enter the metadata database and manually execute sql

# on mysql
alter table jfs_edge
    modify name varbinary(255) not null;
alter table jfs_symlink
    modify target varbinary(4096) not null;


# on postgres
alter table jfs_edge
    alter column name type bytea using name::bytea;

alter table jfs_symlink
    alter column target type bytea using target::bytea;

3. At this time, the old client in the mount state can already write files with non-utf8 file names, but it should be noted that after executing sql, the old version of the client cannot use the metadata engine to remount, That is to say, the client in the non-mounted state is incompatible with the metadata engine after executing sql, and a new version of the client is required to mount.

Close #1684 #1567

[codecov-commenter]

Codecov Report

Merging #1762 (dd552ed) into main (f342a98) will increase coverage by 0.45%.
The diff coverage is 73.33%.

@@            Coverage Diff             @@
##             main    #1762      +/-   ##
==========================================
+ Coverage   61.56%   62.01%   +0.45%     
==========================================
  Files         135      135              
  Lines       22924    22935      +11     
==========================================
+ Hits        14114    14224     +110     
+ Misses       7210     7121      -89     
+ Partials     1600     1590      -10     

Impacted Files	Coverage Δ
pkg/meta/sql.go	67.34% <68.00%> (+0.10%)	⬆️
pkg/meta/dump.go	75.86% <100.00%> (ø)
pkg/meta/redis.go	73.42% <100.00%> (ø)
pkg/meta/tkv.go	76.55% <100.00%> (ø)
pkg/chunk/utils_unix.go	73.33% <0.00%> (-20.00%)	⬇️
cmd/mount.go	67.96% <0.00%> (-2.76%)	⬇️
pkg/vfs/vfs.go	77.98% <0.00%> (+0.06%)	⬆️
pkg/meta/base.go	71.69% <0.00%> (+0.50%)	⬆️
pkg/vfs/writer.go	79.66% <0.00%> (+1.01%)	⬆️
cmd/info.go	70.12% <0.00%> (+1.77%)	⬆️
... and 6 more

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[zhijian-pro]

moved to descripotion

[zhijian-pro]

Close #1684 #1567