Bypass server upload large file is slow because of generating index file

[wwwjn]

According to #3370 and test result, bypass server upload need a lot of time to calculate the index file.

[epicfaace]

Ashwin made a POC here: #4212

But we depend on fixing pauldmccarthy/indexed_gzip#102 and mxmlnkn/ratarmount#95 before it can work.

[epicfaace]

Ashwin: get pauldmccarthy/indexed_gzip#103 to work, Ashwin will also publish a fork of indexed_gzip (indexed_gzip_fileobj_fork_epicfaace)

Jiani: fixing up #4212. Maybe try reverting to the simpler peek solution in ac5ed66. Once Ashwin publishes indexed_gzip fork, change it to use the indexed_gzip fork

import indexed_gzip_fileobj_fork_epicfaace as indexed_gzip

[wwwjn]

POC to fix this problem is here: Using peek() instead of read() in SQLiteIndexedTar for gz files

However, the current Indexed_gzip implementation will not call peek(), instead it calls read(). Simple script to reproduce this: epicfaace/test-repro#12

[wwwjn]

There still some bugs in indexed_gzip, which blocks this issue: pauldmccarthy/indexed_gzip#106

[wwwjn]

Update: Related issue for indexed_gizp github repo: pauldmccarthy/indexed_gzip#107