Document a new functions to encode and decode parts of URI

[TarantoolBot]

Related dev. issue(s): tarantool/tarantool#3682

Product: Tarantool
Since: 2.11
Root document:

• https://www.tarantool.io/en/doc/latest/reference/reference_lua/uri/
• https://www.tarantool.io/en/doc/latest/reference/configuration/#uri
• https://www.tarantool.io/en/doc/latest/reference/reference_lua/http/#making-requests
• https://www.tarantool.io/en/doc/latest/reference/reference_lua/socket/#socket-tcp-connect
• https://www.tarantool.io/en/doc/latest/reference/reference_lua/net_box/#lua-function.net_box.connect
• https://www.tarantool.io/en/doc/latest/reference/reference_lua/console/#console-listen

SME: @ ligurio

Details

New functions uri.escape() and uri.unescape() have been introduced.
First one allows to escape symbols to a string and second one to
unescape symbols to a string according to RFC 3986 [1].

Examples:

tarantool> uri.escape("тарантул")
---
- '%D1%82%D0%B0%D1%80%D0%B0%D0%BD%D1%82%D1%83%D0%BB'
...

tarantool> uri.unescape("%D1%82%D0%B0%D1%80%D0%B0%D0%BD%D1%82%D1%83%D0%BB")
---
- тарантул
...

uri.escape() accepts a string that will be encoded and optionally a
table with encoding options: string with unreserved symbols that will
not be encoded and boolean option that enables/disables encoding of a
space characters as '+'. By default uri.escape() uses a set of
unreserved symbols defined in RFC 3986 ("2.3. Unreserved Characters")
and encoding of space characters as '+' is disabled. Table with default
encoding options is defined as uri.RFC3986.

uri.unescape() accepts a string that will be decoded and optionally a
table with decoding options: string with unreserved symbols (these
symbols are actually unused by decoding function) and boolean option
that enables/disables decoding of '+' as a space character. Table with
default decoding options is defined as uri.RFC3986.

See detailed description in RFC "http: add percent-encoding/decoding of
query string in request" [2].

NO_WRAP

1. Uniform Resource Identifier (URI): Generic Syntax
   https://datatracker.ietf.org/doc/html/rfc3986
2. https://www.notion.so/tarantool/http-add-percent-encoding-decoding-of-query-string-in-request-76a2425a4c4744a1a72643527a4fe7f7
   NO_WRAP
   Requested by @ ligurio in tarantool/tarantool@5ebe186.