Add database config: max db size

[ray6080]

Introduced a new configuration maxDBSize for Database.
maxDBSize is the hard limit of how large (in terms of bytes of disk pages) the database can allocate.
The config value should be no less than 4MB in bytes and be power of 2.
This is temporarily added to let users get around with issues related to not able to mmap the default 8TB virtual memory address space in some runtime environment.

     * @param maxDBSize The maximum size of the database in bytes. Note that this is introduced
     * temporarily for now to get around with the default 8TB mmap address space limit some
     * environment. This will be removed once we implemente a better solution later. The value is
     * default to 1 << 43 (8TB) under 64-bit environment and 1GB under 32-bit one (see
     * `DEFAULT_VM_REGION_MAX_SIZE`).

There are several todos left: reflect the changes in Java/NodeJS/Rust APIs, and CLI.

Before our next major release, we should revisit this and change the mmap allocation to one page/frame group at a time, so we don't need to allocate a given size at once.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.53%. Comparing base (d2cfc65) to head (c7a8785).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2948      +/-   ##
==========================================
+ Coverage   93.51%   93.53%   +0.01%     
==========================================
  Files        1121     1121              
  Lines       42913    42924      +11     
==========================================
+ Hits        40131    40147      +16     
+ Misses       2782     2777       -5     

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